Commit | Line | Data |
---|---|---|
8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
ce5706bd | 4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5d8868ff | 5 | Copyright (C) 2010 Google Inc. |
590051de | 6 | Copyright (C) 2011 ProFUSION Embedded Systems |
422e925b | 7 | Copyright (c) 2012 Code Aurora Forum. All rights reserved. |
1da177e4 LT |
8 | |
9 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
10 | ||
11 | This program is free software; you can redistribute it and/or modify | |
12 | it under the terms of the GNU General Public License version 2 as | |
13 | published by the Free Software Foundation; | |
14 | ||
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
16 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
18 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
19 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
20 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
21 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
22 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
23 | ||
8e87d142 YH |
24 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
25 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
26 | SOFTWARE IS DISCLAIMED. |
27 | */ | |
28 | ||
bb58f747 | 29 | /* Bluetooth L2CAP core. */ |
1da177e4 | 30 | |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | ||
33 | #include <linux/types.h> | |
4fc268d2 | 34 | #include <linux/capability.h> |
1da177e4 LT |
35 | #include <linux/errno.h> |
36 | #include <linux/kernel.h> | |
1da177e4 LT |
37 | #include <linux/sched.h> |
38 | #include <linux/slab.h> | |
39 | #include <linux/poll.h> | |
40 | #include <linux/fcntl.h> | |
41 | #include <linux/init.h> | |
42 | #include <linux/interrupt.h> | |
43 | #include <linux/socket.h> | |
44 | #include <linux/skbuff.h> | |
1da177e4 | 45 | #include <linux/list.h> |
be9d1227 | 46 | #include <linux/device.h> |
aef7d97c MH |
47 | #include <linux/debugfs.h> |
48 | #include <linux/seq_file.h> | |
af05b30b | 49 | #include <linux/uaccess.h> |
fcc203c3 | 50 | #include <linux/crc16.h> |
1da177e4 LT |
51 | #include <net/sock.h> |
52 | ||
1da177e4 LT |
53 | #include <asm/unaligned.h> |
54 | ||
55 | #include <net/bluetooth/bluetooth.h> | |
56 | #include <net/bluetooth/hci_core.h> | |
57 | #include <net/bluetooth/l2cap.h> | |
b501d6a1 | 58 | #include <net/bluetooth/smp.h> |
1da177e4 | 59 | |
b191e031 | 60 | bool disable_ertm = 1; |
f0709e03 | 61 | |
47ec1dcd | 62 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
50a147cd | 63 | static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, }; |
1da177e4 | 64 | |
b5ad8b7f JB |
65 | static LIST_HEAD(chan_list); |
66 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 67 | |
1da177e4 LT |
68 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
69 | u8 code, u8 ident, u16 dlen, void *data); | |
4519de9a GP |
70 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
71 | void *data); | |
710f9b0a | 72 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
4519de9a | 73 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
c5daa683 | 74 | struct l2cap_chan *chan, int err); |
1da177e4 | 75 | |
608bcc6d MM |
76 | static int l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
77 | struct sk_buff_head *skbs, u8 event); | |
78 | ||
0139418c | 79 | /* ---- L2CAP channels ---- */ |
71ba0e56 | 80 | |
baa7e1fa | 81 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 82 | { |
3df91ea2 | 83 | struct l2cap_chan *c; |
3d57dc68 | 84 | |
3df91ea2 AE |
85 | list_for_each_entry(c, &conn->chan_l, list) { |
86 | if (c->dcid == cid) | |
87 | return c; | |
0139418c | 88 | } |
3df91ea2 | 89 | return NULL; |
0139418c MH |
90 | } |
91 | ||
baa7e1fa | 92 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 93 | { |
3df91ea2 | 94 | struct l2cap_chan *c; |
3d57dc68 | 95 | |
3df91ea2 AE |
96 | list_for_each_entry(c, &conn->chan_l, list) { |
97 | if (c->scid == cid) | |
98 | return c; | |
0139418c | 99 | } |
3df91ea2 | 100 | return NULL; |
0139418c MH |
101 | } |
102 | ||
103 | /* Find channel with given SCID. | |
ef191ade | 104 | * Returns locked channel. */ |
baa7e1fa | 105 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 106 | { |
48454079 | 107 | struct l2cap_chan *c; |
baa7e1fa | 108 | |
3df91ea2 | 109 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 110 | c = __l2cap_get_chan_by_scid(conn, cid); |
ef191ade MM |
111 | if (c) |
112 | l2cap_chan_lock(c); | |
3df91ea2 AE |
113 | mutex_unlock(&conn->chan_lock); |
114 | ||
48454079 | 115 | return c; |
0139418c MH |
116 | } |
117 | ||
baa7e1fa | 118 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 119 | { |
3df91ea2 | 120 | struct l2cap_chan *c; |
3d57dc68 | 121 | |
3df91ea2 AE |
122 | list_for_each_entry(c, &conn->chan_l, list) { |
123 | if (c->ident == ident) | |
124 | return c; | |
0139418c | 125 | } |
3df91ea2 | 126 | return NULL; |
0139418c MH |
127 | } |
128 | ||
23691d75 | 129 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 130 | { |
23691d75 | 131 | struct l2cap_chan *c; |
9e4425ff | 132 | |
23691d75 GP |
133 | list_for_each_entry(c, &chan_list, global_l) { |
134 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
250938cb | 135 | return c; |
9e4425ff | 136 | } |
250938cb | 137 | return NULL; |
9e4425ff GP |
138 | } |
139 | ||
140 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
141 | { | |
73b2ec18 GP |
142 | int err; |
143 | ||
333055f2 | 144 | write_lock(&chan_list_lock); |
9e4425ff | 145 | |
23691d75 | 146 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
147 | err = -EADDRINUSE; |
148 | goto done; | |
9e4425ff GP |
149 | } |
150 | ||
73b2ec18 GP |
151 | if (psm) { |
152 | chan->psm = psm; | |
153 | chan->sport = psm; | |
154 | err = 0; | |
155 | } else { | |
156 | u16 p; | |
157 | ||
158 | err = -EINVAL; | |
159 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 160 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
161 | chan->psm = cpu_to_le16(p); |
162 | chan->sport = cpu_to_le16(p); | |
163 | err = 0; | |
164 | break; | |
165 | } | |
166 | } | |
9e4425ff | 167 | |
73b2ec18 | 168 | done: |
333055f2 | 169 | write_unlock(&chan_list_lock); |
73b2ec18 | 170 | return err; |
9e4425ff GP |
171 | } |
172 | ||
173 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
174 | { | |
333055f2 | 175 | write_lock(&chan_list_lock); |
9e4425ff GP |
176 | |
177 | chan->scid = scid; | |
178 | ||
333055f2 | 179 | write_unlock(&chan_list_lock); |
9e4425ff GP |
180 | |
181 | return 0; | |
182 | } | |
183 | ||
baa7e1fa | 184 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 185 | { |
8db4dc46 | 186 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 187 | |
8db4dc46 | 188 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 189 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
190 | return cid; |
191 | } | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
0e587be7 | 196 | static void __l2cap_state_change(struct l2cap_chan *chan, int state) |
89bc500e | 197 | { |
42d2d87c | 198 | BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), |
badaaa00 GP |
199 | state_to_string(state)); |
200 | ||
89bc500e GP |
201 | chan->state = state; |
202 | chan->ops->state_change(chan->data, state); | |
203 | } | |
204 | ||
0e587be7 AE |
205 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
206 | { | |
207 | struct sock *sk = chan->sk; | |
208 | ||
209 | lock_sock(sk); | |
210 | __l2cap_state_change(chan, state); | |
211 | release_sock(sk); | |
212 | } | |
213 | ||
2e0052e4 AE |
214 | static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err) |
215 | { | |
216 | struct sock *sk = chan->sk; | |
217 | ||
218 | sk->sk_err = err; | |
219 | } | |
220 | ||
221 | static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) | |
222 | { | |
223 | struct sock *sk = chan->sk; | |
224 | ||
225 | lock_sock(sk); | |
226 | __l2cap_chan_set_err(chan, err); | |
227 | release_sock(sk); | |
228 | } | |
229 | ||
4239d16f MM |
230 | static void __set_retrans_timer(struct l2cap_chan *chan) |
231 | { | |
232 | if (!delayed_work_pending(&chan->monitor_timer) && | |
233 | chan->retrans_timeout) { | |
234 | l2cap_set_timer(chan, &chan->retrans_timer, | |
235 | msecs_to_jiffies(chan->retrans_timeout)); | |
236 | } | |
237 | } | |
238 | ||
239 | static void __set_monitor_timer(struct l2cap_chan *chan) | |
240 | { | |
241 | __clear_retrans_timer(chan); | |
242 | if (chan->monitor_timeout) { | |
243 | l2cap_set_timer(chan, &chan->monitor_timer, | |
244 | msecs_to_jiffies(chan->monitor_timeout)); | |
245 | } | |
246 | } | |
247 | ||
608bcc6d MM |
248 | static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, |
249 | u16 seq) | |
250 | { | |
251 | struct sk_buff *skb; | |
252 | ||
253 | skb_queue_walk(head, skb) { | |
254 | if (bt_cb(skb)->control.txseq == seq) | |
255 | return skb; | |
256 | } | |
257 | ||
258 | return NULL; | |
259 | } | |
260 | ||
3c588192 MM |
261 | /* ---- L2CAP sequence number lists ---- */ |
262 | ||
263 | /* For ERTM, ordered lists of sequence numbers must be tracked for | |
264 | * SREJ requests that are received and for frames that are to be | |
265 | * retransmitted. These seq_list functions implement a singly-linked | |
266 | * list in an array, where membership in the list can also be checked | |
267 | * in constant time. Items can also be added to the tail of the list | |
268 | * and removed from the head in constant time, without further memory | |
269 | * allocs or frees. | |
270 | */ | |
271 | ||
272 | static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) | |
273 | { | |
274 | size_t alloc_size, i; | |
275 | ||
276 | /* Allocated size is a power of 2 to map sequence numbers | |
277 | * (which may be up to 14 bits) in to a smaller array that is | |
278 | * sized for the negotiated ERTM transmit windows. | |
279 | */ | |
280 | alloc_size = roundup_pow_of_two(size); | |
281 | ||
282 | seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); | |
283 | if (!seq_list->list) | |
284 | return -ENOMEM; | |
285 | ||
286 | seq_list->mask = alloc_size - 1; | |
287 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
288 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
289 | for (i = 0; i < alloc_size; i++) | |
290 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
295 | static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) | |
296 | { | |
297 | kfree(seq_list->list); | |
298 | } | |
299 | ||
300 | static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, | |
301 | u16 seq) | |
302 | { | |
303 | /* Constant-time check for list membership */ | |
304 | return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; | |
305 | } | |
306 | ||
307 | static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq) | |
308 | { | |
309 | u16 mask = seq_list->mask; | |
310 | ||
311 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) { | |
312 | /* In case someone tries to pop the head of an empty list */ | |
313 | return L2CAP_SEQ_LIST_CLEAR; | |
314 | } else if (seq_list->head == seq) { | |
315 | /* Head can be removed in constant time */ | |
316 | seq_list->head = seq_list->list[seq & mask]; | |
317 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
318 | ||
319 | if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { | |
320 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
321 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
322 | } | |
323 | } else { | |
324 | /* Walk the list to find the sequence number */ | |
325 | u16 prev = seq_list->head; | |
326 | while (seq_list->list[prev & mask] != seq) { | |
327 | prev = seq_list->list[prev & mask]; | |
328 | if (prev == L2CAP_SEQ_LIST_TAIL) | |
329 | return L2CAP_SEQ_LIST_CLEAR; | |
330 | } | |
331 | ||
332 | /* Unlink the number from the list and clear it */ | |
333 | seq_list->list[prev & mask] = seq_list->list[seq & mask]; | |
334 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
335 | if (seq_list->tail == seq) | |
336 | seq_list->tail = prev; | |
337 | } | |
338 | return seq; | |
339 | } | |
340 | ||
341 | static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) | |
342 | { | |
343 | /* Remove the head in constant time */ | |
344 | return l2cap_seq_list_remove(seq_list, seq_list->head); | |
345 | } | |
346 | ||
347 | static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) | |
348 | { | |
f522ae36 | 349 | u16 i; |
3c588192 | 350 | |
f522ae36 GP |
351 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) |
352 | return; | |
353 | ||
354 | for (i = 0; i <= seq_list->mask; i++) | |
355 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
356 | ||
357 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
358 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 MM |
359 | } |
360 | ||
361 | static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) | |
362 | { | |
363 | u16 mask = seq_list->mask; | |
364 | ||
365 | /* All appends happen in constant time */ | |
366 | ||
f522ae36 GP |
367 | if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) |
368 | return; | |
3c588192 | 369 | |
f522ae36 GP |
370 | if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) |
371 | seq_list->head = seq; | |
372 | else | |
373 | seq_list->list[seq_list->tail & mask] = seq; | |
374 | ||
375 | seq_list->tail = seq; | |
376 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; | |
3c588192 MM |
377 | } |
378 | ||
721c4181 | 379 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 380 | { |
721c4181 GP |
381 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
382 | chan_timer.work); | |
3df91ea2 | 383 | struct l2cap_conn *conn = chan->conn; |
ab07801d GP |
384 | int reason; |
385 | ||
e05dcc32 | 386 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
ab07801d | 387 | |
3df91ea2 | 388 | mutex_lock(&conn->chan_lock); |
6be36555 | 389 | l2cap_chan_lock(chan); |
ab07801d | 390 | |
89bc500e | 391 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 392 | reason = ECONNREFUSED; |
89bc500e | 393 | else if (chan->state == BT_CONNECT && |
ab07801d GP |
394 | chan->sec_level != BT_SECURITY_SDP) |
395 | reason = ECONNREFUSED; | |
396 | else | |
397 | reason = ETIMEDOUT; | |
398 | ||
0f852724 | 399 | l2cap_chan_close(chan, reason); |
ab07801d | 400 | |
6be36555 | 401 | l2cap_chan_unlock(chan); |
ab07801d | 402 | |
ba3bd0ee | 403 | chan->ops->close(chan->data); |
3df91ea2 AE |
404 | mutex_unlock(&conn->chan_lock); |
405 | ||
371fd835 | 406 | l2cap_chan_put(chan); |
ab07801d GP |
407 | } |
408 | ||
eef1d9b6 | 409 | struct l2cap_chan *l2cap_chan_create(void) |
48454079 GP |
410 | { |
411 | struct l2cap_chan *chan; | |
412 | ||
413 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
414 | if (!chan) | |
415 | return NULL; | |
416 | ||
c03b355e AE |
417 | mutex_init(&chan->lock); |
418 | ||
333055f2 | 419 | write_lock(&chan_list_lock); |
23691d75 | 420 | list_add(&chan->global_l, &chan_list); |
333055f2 | 421 | write_unlock(&chan_list_lock); |
23691d75 | 422 | |
721c4181 | 423 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 424 | |
89bc500e GP |
425 | chan->state = BT_OPEN; |
426 | ||
71ba0e56 GP |
427 | atomic_set(&chan->refcnt, 1); |
428 | ||
2827011f MM |
429 | /* This flag is cleared in l2cap_chan_ready() */ |
430 | set_bit(CONF_NOT_COMPLETE, &chan->conf_state); | |
431 | ||
eef1d9b6 | 432 | BT_DBG("chan %p", chan); |
abc545b8 | 433 | |
48454079 GP |
434 | return chan; |
435 | } | |
436 | ||
23691d75 | 437 | void l2cap_chan_destroy(struct l2cap_chan *chan) |
6ff5abbf | 438 | { |
333055f2 | 439 | write_lock(&chan_list_lock); |
23691d75 | 440 | list_del(&chan->global_l); |
333055f2 | 441 | write_unlock(&chan_list_lock); |
23691d75 | 442 | |
371fd835 | 443 | l2cap_chan_put(chan); |
6ff5abbf GP |
444 | } |
445 | ||
bd4b1653 AE |
446 | void l2cap_chan_set_defaults(struct l2cap_chan *chan) |
447 | { | |
448 | chan->fcs = L2CAP_FCS_CRC16; | |
449 | chan->max_tx = L2CAP_DEFAULT_MAX_TX; | |
450 | chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; | |
451 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; | |
452 | chan->sec_level = BT_SECURITY_LOW; | |
453 | ||
454 | set_bit(FLAG_FORCE_ACTIVE, &chan->flags); | |
455 | } | |
456 | ||
14a28491 | 457 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 458 | { |
af05b30b | 459 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
097db76c | 460 | __le16_to_cpu(chan->psm), chan->dcid); |
0139418c | 461 | |
9f5a0d7b | 462 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 463 | |
8c1d787b | 464 | chan->conn = conn; |
0139418c | 465 | |
5491120e AE |
466 | switch (chan->chan_type) { |
467 | case L2CAP_CHAN_CONN_ORIENTED: | |
b62f328b VT |
468 | if (conn->hcon->type == LE_LINK) { |
469 | /* LE connection */ | |
0c1bc5c6 | 470 | chan->omtu = L2CAP_LE_DEFAULT_MTU; |
fe4128e0 GP |
471 | chan->scid = L2CAP_CID_LE_DATA; |
472 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
473 | } else { |
474 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 475 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 476 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 477 | } |
5491120e AE |
478 | break; |
479 | ||
480 | case L2CAP_CHAN_CONN_LESS: | |
0139418c | 481 | /* Connectionless socket */ |
fe4128e0 GP |
482 | chan->scid = L2CAP_CID_CONN_LESS; |
483 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 484 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
485 | break; |
486 | ||
487 | default: | |
0139418c | 488 | /* Raw socket can send/recv signalling messages only */ |
fe4128e0 GP |
489 | chan->scid = L2CAP_CID_SIGNALING; |
490 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 491 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
492 | } |
493 | ||
8f7975b1 AE |
494 | chan->local_id = L2CAP_BESTEFFORT_ID; |
495 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
496 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
497 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
498 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
499 | chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO; | |
500 | ||
371fd835 | 501 | l2cap_chan_hold(chan); |
baa7e1fa | 502 | |
3df91ea2 | 503 | list_add(&chan->list, &conn->chan_l); |
643162a8 AE |
504 | } |
505 | ||
14a28491 | 506 | static void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
643162a8 AE |
507 | { |
508 | mutex_lock(&conn->chan_lock); | |
509 | __l2cap_chan_add(conn, chan); | |
3df91ea2 | 510 | mutex_unlock(&conn->chan_lock); |
0139418c MH |
511 | } |
512 | ||
4519de9a | 513 | static void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 514 | { |
48454079 | 515 | struct sock *sk = chan->sk; |
8c1d787b | 516 | struct l2cap_conn *conn = chan->conn; |
0139418c MH |
517 | struct sock *parent = bt_sk(sk)->parent; |
518 | ||
c9b66675 | 519 | __clear_chan_timer(chan); |
0139418c | 520 | |
49208c9c | 521 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 522 | |
8e87d142 | 523 | if (conn) { |
baa7e1fa | 524 | /* Delete from channel list */ |
3df91ea2 | 525 | list_del(&chan->list); |
3d57dc68 | 526 | |
371fd835 | 527 | l2cap_chan_put(chan); |
baa7e1fa | 528 | |
8c1d787b | 529 | chan->conn = NULL; |
0139418c MH |
530 | hci_conn_put(conn->hcon); |
531 | } | |
532 | ||
6be36555 AE |
533 | lock_sock(sk); |
534 | ||
0e587be7 | 535 | __l2cap_state_change(chan, BT_CLOSED); |
0139418c MH |
536 | sock_set_flag(sk, SOCK_ZAPPED); |
537 | ||
538 | if (err) | |
2e0052e4 | 539 | __l2cap_chan_set_err(chan, err); |
0139418c MH |
540 | |
541 | if (parent) { | |
542 | bt_accept_unlink(sk); | |
543 | parent->sk_data_ready(parent, 0); | |
544 | } else | |
545 | sk->sk_state_change(sk); | |
c13ffa62 | 546 | |
6be36555 AE |
547 | release_sock(sk); |
548 | ||
2827011f | 549 | if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
6ff5abbf | 550 | return; |
2ead70b8 | 551 | |
58d35f87 | 552 | skb_queue_purge(&chan->tx_q); |
c13ffa62 | 553 | |
0c1bc5c6 | 554 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
555 | __clear_retrans_timer(chan); |
556 | __clear_monitor_timer(chan); | |
557 | __clear_ack_timer(chan); | |
c13ffa62 | 558 | |
f1c6775b | 559 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 560 | |
3c588192 MM |
561 | l2cap_seq_list_free(&chan->srej_list); |
562 | l2cap_seq_list_free(&chan->retrans_list); | |
c13ffa62 | 563 | } |
0139418c MH |
564 | } |
565 | ||
4519de9a GP |
566 | static void l2cap_chan_cleanup_listen(struct sock *parent) |
567 | { | |
568 | struct sock *sk; | |
569 | ||
570 | BT_DBG("parent %p", parent); | |
571 | ||
572 | /* Close not yet accepted channels */ | |
0f852724 | 573 | while ((sk = bt_accept_dequeue(parent, NULL))) { |
ba3bd0ee | 574 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
3df91ea2 | 575 | |
6be36555 | 576 | l2cap_chan_lock(chan); |
c9b66675 | 577 | __clear_chan_timer(chan); |
ba3bd0ee | 578 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 579 | l2cap_chan_unlock(chan); |
3df91ea2 | 580 | |
ba3bd0ee | 581 | chan->ops->close(chan->data); |
0f852724 | 582 | } |
4519de9a GP |
583 | } |
584 | ||
0f852724 | 585 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
586 | { |
587 | struct l2cap_conn *conn = chan->conn; | |
588 | struct sock *sk = chan->sk; | |
589 | ||
e05dcc32 AE |
590 | BT_DBG("chan %p state %s sk %p", chan, |
591 | state_to_string(chan->state), sk); | |
4519de9a | 592 | |
89bc500e | 593 | switch (chan->state) { |
4519de9a | 594 | case BT_LISTEN: |
6be36555 | 595 | lock_sock(sk); |
4519de9a | 596 | l2cap_chan_cleanup_listen(sk); |
89bc500e | 597 | |
0e587be7 | 598 | __l2cap_state_change(chan, BT_CLOSED); |
89bc500e | 599 | sock_set_flag(sk, SOCK_ZAPPED); |
6be36555 | 600 | release_sock(sk); |
4519de9a GP |
601 | break; |
602 | ||
603 | case BT_CONNECTED: | |
604 | case BT_CONFIG: | |
715ec005 | 605 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a | 606 | conn->hcon->type == ACL_LINK) { |
c9b66675 | 607 | __set_chan_timer(chan, sk->sk_sndtimeo); |
4519de9a GP |
608 | l2cap_send_disconn_req(conn, chan, reason); |
609 | } else | |
610 | l2cap_chan_del(chan, reason); | |
611 | break; | |
612 | ||
613 | case BT_CONNECT2: | |
715ec005 | 614 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a GP |
615 | conn->hcon->type == ACL_LINK) { |
616 | struct l2cap_conn_rsp rsp; | |
617 | __u16 result; | |
618 | ||
c5daa683 | 619 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) |
4519de9a GP |
620 | result = L2CAP_CR_SEC_BLOCK; |
621 | else | |
622 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 623 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
624 | |
625 | rsp.scid = cpu_to_le16(chan->dcid); | |
626 | rsp.dcid = cpu_to_le16(chan->scid); | |
627 | rsp.result = cpu_to_le16(result); | |
628 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
629 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, | |
630 | sizeof(rsp), &rsp); | |
631 | } | |
632 | ||
633 | l2cap_chan_del(chan, reason); | |
634 | break; | |
635 | ||
636 | case BT_CONNECT: | |
637 | case BT_DISCONN: | |
638 | l2cap_chan_del(chan, reason); | |
639 | break; | |
640 | ||
641 | default: | |
6be36555 | 642 | lock_sock(sk); |
4519de9a | 643 | sock_set_flag(sk, SOCK_ZAPPED); |
6be36555 | 644 | release_sock(sk); |
4519de9a GP |
645 | break; |
646 | } | |
647 | } | |
648 | ||
4343478f | 649 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 650 | { |
715ec005 | 651 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 652 | switch (chan->sec_level) { |
8556edd3 JH |
653 | case BT_SECURITY_HIGH: |
654 | return HCI_AT_DEDICATED_BONDING_MITM; | |
655 | case BT_SECURITY_MEDIUM: | |
656 | return HCI_AT_DEDICATED_BONDING; | |
657 | default: | |
658 | return HCI_AT_NO_BONDING; | |
659 | } | |
fe4128e0 | 660 | } else if (chan->psm == cpu_to_le16(0x0001)) { |
4343478f GP |
661 | if (chan->sec_level == BT_SECURITY_LOW) |
662 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 663 | |
4343478f | 664 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 665 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 666 | else |
8556edd3 | 667 | return HCI_AT_NO_BONDING; |
00ae4af9 | 668 | } else { |
4343478f | 669 | switch (chan->sec_level) { |
00ae4af9 | 670 | case BT_SECURITY_HIGH: |
8556edd3 | 671 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 672 | case BT_SECURITY_MEDIUM: |
8556edd3 | 673 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 674 | default: |
8556edd3 | 675 | return HCI_AT_NO_BONDING; |
00ae4af9 | 676 | } |
0684e5f9 | 677 | } |
8556edd3 JH |
678 | } |
679 | ||
680 | /* Service level security */ | |
d45fc423 | 681 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 682 | { |
8c1d787b | 683 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
684 | __u8 auth_type; |
685 | ||
4343478f | 686 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 687 | |
4343478f | 688 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
689 | } |
690 | ||
b5ad8b7f | 691 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
692 | { |
693 | u8 id; | |
694 | ||
695 | /* Get next available identificator. | |
696 | * 1 - 128 are used by kernel. | |
697 | * 129 - 199 are reserved. | |
698 | * 200 - 254 are used by utilities like l2ping, etc. | |
699 | */ | |
700 | ||
333055f2 | 701 | spin_lock(&conn->lock); |
4e8402a3 MH |
702 | |
703 | if (++conn->tx_ident > 128) | |
704 | conn->tx_ident = 1; | |
705 | ||
706 | id = conn->tx_ident; | |
707 | ||
333055f2 | 708 | spin_unlock(&conn->lock); |
4e8402a3 MH |
709 | |
710 | return id; | |
711 | } | |
712 | ||
4519de9a | 713 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
714 | { |
715 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 716 | u8 flags; |
4e8402a3 MH |
717 | |
718 | BT_DBG("code 0x%2.2x", code); | |
719 | ||
720 | if (!skb) | |
9a9c6a34 | 721 | return; |
4e8402a3 | 722 | |
e702112f AE |
723 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
724 | flags = ACL_START_NO_FLUSH; | |
725 | else | |
726 | flags = ACL_START; | |
727 | ||
14b12d0b | 728 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 729 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 730 | |
73d80deb LAD |
731 | hci_send_acl(conn->hchan, skb, flags); |
732 | } | |
733 | ||
734 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) | |
735 | { | |
736 | struct hci_conn *hcon = chan->conn->hcon; | |
737 | u16 flags; | |
738 | ||
739 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
740 | skb->priority); | |
741 | ||
742 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
743 | lmp_no_flush_capable(hcon->hdev)) | |
744 | flags = ACL_START_NO_FLUSH; | |
745 | else | |
746 | flags = ACL_START; | |
14b12d0b | 747 | |
73d80deb LAD |
748 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
749 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
750 | } |
751 | ||
b76bbd66 MM |
752 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
753 | { | |
754 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
755 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
756 | ||
757 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
758 | /* S-Frame */ | |
759 | control->sframe = 1; | |
760 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
761 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
762 | ||
763 | control->sar = 0; | |
764 | control->txseq = 0; | |
765 | } else { | |
766 | /* I-Frame */ | |
767 | control->sframe = 0; | |
768 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
769 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
770 | ||
771 | control->poll = 0; | |
772 | control->super = 0; | |
773 | } | |
774 | } | |
775 | ||
b76bbd66 MM |
776 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
777 | { | |
778 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
779 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
780 | ||
781 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
782 | /* S-Frame */ | |
783 | control->sframe = 1; | |
784 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
785 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
786 | ||
787 | control->sar = 0; | |
788 | control->txseq = 0; | |
789 | } else { | |
790 | /* I-Frame */ | |
791 | control->sframe = 0; | |
792 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
793 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
794 | ||
795 | control->poll = 0; | |
796 | control->super = 0; | |
797 | } | |
798 | } | |
799 | ||
800 | static inline void __unpack_control(struct l2cap_chan *chan, | |
801 | struct sk_buff *skb) | |
802 | { | |
803 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
804 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
805 | &bt_cb(skb)->control); | |
cec8ab6e | 806 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
807 | } else { |
808 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
809 | &bt_cb(skb)->control); | |
cec8ab6e | 810 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
811 | } |
812 | } | |
813 | ||
b5c6aaed MM |
814 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
815 | { | |
816 | u32 packed; | |
817 | ||
818 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
819 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
820 | ||
821 | if (control->sframe) { | |
822 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
823 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
824 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
825 | } else { | |
826 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
827 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
828 | } | |
829 | ||
830 | return packed; | |
831 | } | |
832 | ||
833 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
834 | { | |
835 | u16 packed; | |
836 | ||
837 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
838 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
839 | ||
840 | if (control->sframe) { | |
841 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
842 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
843 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
844 | } else { | |
845 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
846 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
847 | } | |
848 | ||
849 | return packed; | |
850 | } | |
851 | ||
b76bbd66 MM |
852 | static inline void __pack_control(struct l2cap_chan *chan, |
853 | struct l2cap_ctrl *control, | |
854 | struct sk_buff *skb) | |
855 | { | |
856 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
857 | put_unaligned_le32(__pack_extended_control(control), | |
858 | skb->data + L2CAP_HDR_SIZE); | |
859 | } else { | |
860 | put_unaligned_le16(__pack_enhanced_control(control), | |
861 | skb->data + L2CAP_HDR_SIZE); | |
862 | } | |
863 | } | |
864 | ||
a67d7f6f MM |
865 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
866 | u32 control) | |
b5c6aaed MM |
867 | { |
868 | struct sk_buff *skb; | |
869 | struct l2cap_hdr *lh; | |
a67d7f6f | 870 | int hlen; |
b5c6aaed MM |
871 | |
872 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
873 | hlen = L2CAP_EXT_HDR_SIZE; | |
874 | else | |
875 | hlen = L2CAP_ENH_HDR_SIZE; | |
876 | ||
877 | if (chan->fcs == L2CAP_FCS_CRC16) | |
878 | hlen += L2CAP_FCS_SIZE; | |
879 | ||
a67d7f6f | 880 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 881 | |
b5c6aaed | 882 | if (!skb) |
a67d7f6f | 883 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
884 | |
885 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
886 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
887 | lh->cid = cpu_to_le16(chan->dcid); | |
888 | ||
a67d7f6f MM |
889 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
890 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
891 | else | |
892 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
893 | |
894 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 895 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
896 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
897 | } | |
898 | ||
899 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
900 | return skb; |
901 | } | |
902 | ||
903 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
904 | struct l2cap_ctrl *control) | |
905 | { | |
906 | struct sk_buff *skb; | |
907 | u32 control_field; | |
908 | ||
909 | BT_DBG("chan %p, control %p", chan, control); | |
910 | ||
911 | if (!control->sframe) | |
912 | return; | |
913 | ||
914 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && | |
915 | !control->poll) | |
916 | control->final = 1; | |
917 | ||
918 | if (control->super == L2CAP_SUPER_RR) | |
919 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
920 | else if (control->super == L2CAP_SUPER_RNR) | |
921 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
922 | ||
923 | if (control->super != L2CAP_SUPER_SREJ) { | |
924 | chan->last_acked_seq = control->reqseq; | |
925 | __clear_ack_timer(chan); | |
926 | } | |
927 | ||
928 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
929 | control->final, control->poll, control->super); | |
930 | ||
931 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
932 | control_field = __pack_extended_control(control); | |
933 | else | |
934 | control_field = __pack_enhanced_control(control); | |
935 | ||
936 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
937 | if (!IS_ERR(skb)) | |
938 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
939 | } |
940 | ||
c9e3d5e0 | 941 | static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
b5c6aaed | 942 | { |
c9e3d5e0 MM |
943 | struct l2cap_ctrl control; |
944 | ||
945 | BT_DBG("chan %p, poll %d", chan, poll); | |
946 | ||
947 | memset(&control, 0, sizeof(control)); | |
948 | control.sframe = 1; | |
949 | control.poll = poll; | |
950 | ||
951 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
952 | control.super = L2CAP_SUPER_RNR; | |
953 | else | |
954 | control.super = L2CAP_SUPER_RR; | |
b5c6aaed | 955 | |
c9e3d5e0 MM |
956 | control.reqseq = chan->buffer_seq; |
957 | l2cap_send_sframe(chan, &control); | |
b5c6aaed MM |
958 | } |
959 | ||
b4450035 | 960 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 961 | { |
c1360a1c | 962 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
963 | } |
964 | ||
9b27f350 AE |
965 | static void l2cap_send_conn_req(struct l2cap_chan *chan) |
966 | { | |
967 | struct l2cap_conn *conn = chan->conn; | |
968 | struct l2cap_conn_req req; | |
969 | ||
970 | req.scid = cpu_to_le16(chan->scid); | |
971 | req.psm = chan->psm; | |
972 | ||
973 | chan->ident = l2cap_get_ident(conn); | |
974 | ||
975 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
976 | ||
977 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
978 | } | |
979 | ||
9f0caeb1 VCG |
980 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
981 | { | |
982 | struct sock *sk = chan->sk; | |
983 | struct sock *parent; | |
984 | ||
985 | lock_sock(sk); | |
986 | ||
987 | parent = bt_sk(sk)->parent; | |
988 | ||
989 | BT_DBG("sk %p, parent %p", sk, parent); | |
990 | ||
2827011f | 991 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
992 | chan->conf_state = 0; |
993 | __clear_chan_timer(chan); | |
994 | ||
995 | __l2cap_state_change(chan, BT_CONNECTED); | |
996 | sk->sk_state_change(sk); | |
997 | ||
998 | if (parent) | |
999 | parent->sk_data_ready(parent, 0); | |
1000 | ||
1001 | release_sock(sk); | |
1002 | } | |
1003 | ||
fc7f8a7e | 1004 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 1005 | { |
8c1d787b | 1006 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 1007 | |
9f0caeb1 VCG |
1008 | if (conn->hcon->type == LE_LINK) { |
1009 | l2cap_chan_ready(chan); | |
1010 | return; | |
1011 | } | |
1012 | ||
79d554a6 | 1013 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
1014 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
1015 | return; | |
1016 | ||
d45fc423 | 1017 | if (l2cap_chan_check_security(chan) && |
9b27f350 AE |
1018 | __l2cap_no_conn_pending(chan)) |
1019 | l2cap_send_conn_req(chan); | |
79d554a6 MH |
1020 | } else { |
1021 | struct l2cap_info_req req; | |
1022 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
1023 | ||
1024 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
1025 | conn->info_ident = l2cap_get_ident(conn); | |
1026 | ||
ba13ccd9 | 1027 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
1028 | |
1029 | l2cap_send_cmd(conn, conn->info_ident, | |
1030 | L2CAP_INFO_REQ, sizeof(req), &req); | |
1031 | } | |
1032 | } | |
1033 | ||
cf6c2c0b GP |
1034 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
1035 | { | |
1036 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 1037 | if (!disable_ertm) |
cf6c2c0b GP |
1038 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
1039 | ||
1040 | switch (mode) { | |
1041 | case L2CAP_MODE_ERTM: | |
1042 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
1043 | case L2CAP_MODE_STREAMING: | |
1044 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
1045 | default: | |
1046 | return 0x00; | |
1047 | } | |
1048 | } | |
1049 | ||
4519de9a | 1050 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 1051 | { |
6be36555 | 1052 | struct sock *sk = chan->sk; |
22121fc9 GP |
1053 | struct l2cap_disconn_req req; |
1054 | ||
c13ffa62 GP |
1055 | if (!conn) |
1056 | return; | |
1057 | ||
0c1bc5c6 | 1058 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
1059 | __clear_retrans_timer(chan); |
1060 | __clear_monitor_timer(chan); | |
1061 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1062 | } |
1063 | ||
fe4128e0 GP |
1064 | req.dcid = cpu_to_le16(chan->dcid); |
1065 | req.scid = cpu_to_le16(chan->scid); | |
22121fc9 GP |
1066 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
1067 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 | 1068 | |
6be36555 | 1069 | lock_sock(sk); |
0e587be7 | 1070 | __l2cap_state_change(chan, BT_DISCONN); |
2e0052e4 | 1071 | __l2cap_chan_set_err(chan, err); |
6be36555 | 1072 | release_sock(sk); |
22121fc9 GP |
1073 | } |
1074 | ||
1da177e4 | 1075 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1076 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1077 | { | |
3df91ea2 | 1078 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1079 | |
1080 | BT_DBG("conn %p", conn); | |
1081 | ||
3df91ea2 | 1082 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1083 | |
3df91ea2 | 1084 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 1085 | struct sock *sk = chan->sk; |
baa7e1fa | 1086 | |
6be36555 | 1087 | l2cap_chan_lock(chan); |
4e8402a3 | 1088 | |
715ec005 | 1089 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1090 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1091 | continue; |
1092 | } | |
1093 | ||
89bc500e | 1094 | if (chan->state == BT_CONNECT) { |
d45fc423 | 1095 | if (!l2cap_chan_check_security(chan) || |
b4450035 | 1096 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1097 | l2cap_chan_unlock(chan); |
47731de7 GP |
1098 | continue; |
1099 | } | |
79d554a6 | 1100 | |
c1360a1c GP |
1101 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
1102 | && test_bit(CONF_STATE2_DEVICE, | |
1103 | &chan->conf_state)) { | |
89bc500e | 1104 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1105 | l2cap_chan_unlock(chan); |
47731de7 | 1106 | continue; |
b1235d79 | 1107 | } |
47731de7 | 1108 | |
9b27f350 | 1109 | l2cap_send_conn_req(chan); |
47731de7 | 1110 | |
89bc500e | 1111 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1112 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1113 | char buf[128]; |
fe4128e0 GP |
1114 | rsp.scid = cpu_to_le16(chan->dcid); |
1115 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1116 | |
d45fc423 | 1117 | if (l2cap_chan_check_security(chan)) { |
6be36555 | 1118 | lock_sock(sk); |
c5daa683 GP |
1119 | if (test_bit(BT_SK_DEFER_SETUP, |
1120 | &bt_sk(sk)->flags)) { | |
f66dc81f MH |
1121 | struct sock *parent = bt_sk(sk)->parent; |
1122 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
1123 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
05e9a2f6 IK |
1124 | if (parent) |
1125 | parent->sk_data_ready(parent, 0); | |
f66dc81f MH |
1126 | |
1127 | } else { | |
0e587be7 | 1128 | __l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
1129 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
1130 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
1131 | } | |
6be36555 | 1132 | release_sock(sk); |
79d554a6 MH |
1133 | } else { |
1134 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
1135 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
1136 | } | |
1137 | ||
fc7f8a7e GP |
1138 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
1139 | sizeof(rsp), &rsp); | |
e9aeb2dd | 1140 | |
c1360a1c | 1141 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
e9aeb2dd | 1142 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1143 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1144 | continue; |
1145 | } | |
1146 | ||
c1360a1c | 1147 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1148 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
1149 | l2cap_build_conf_req(chan, buf), buf); |
1150 | chan->num_conf_req++; | |
4e8402a3 MH |
1151 | } |
1152 | ||
6be36555 | 1153 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1154 | } |
1155 | ||
3df91ea2 | 1156 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1157 | } |
1158 | ||
c2287681 | 1159 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1160 | * Returns closest match, locked. |
1161 | */ | |
d9b88702 | 1162 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1163 | bdaddr_t *src, |
1164 | bdaddr_t *dst) | |
b62f328b | 1165 | { |
23691d75 | 1166 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1167 | |
23691d75 | 1168 | read_lock(&chan_list_lock); |
b62f328b | 1169 | |
23691d75 GP |
1170 | list_for_each_entry(c, &chan_list, global_l) { |
1171 | struct sock *sk = c->sk; | |
fe4128e0 | 1172 | |
89bc500e | 1173 | if (state && c->state != state) |
b62f328b VT |
1174 | continue; |
1175 | ||
23691d75 | 1176 | if (c->scid == cid) { |
c2287681 IY |
1177 | int src_match, dst_match; |
1178 | int src_any, dst_any; | |
1179 | ||
b62f328b | 1180 | /* Exact match. */ |
c2287681 IY |
1181 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1182 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1183 | if (src_match && dst_match) { | |
23691d75 GP |
1184 | read_unlock(&chan_list_lock); |
1185 | return c; | |
1186 | } | |
b62f328b VT |
1187 | |
1188 | /* Closest match */ | |
c2287681 IY |
1189 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1190 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1191 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1192 | (src_any && dst_any)) | |
23691d75 | 1193 | c1 = c; |
b62f328b VT |
1194 | } |
1195 | } | |
280f294f | 1196 | |
23691d75 | 1197 | read_unlock(&chan_list_lock); |
b62f328b | 1198 | |
23691d75 | 1199 | return c1; |
b62f328b VT |
1200 | } |
1201 | ||
1202 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1203 | { | |
c916fbe4 | 1204 | struct sock *parent, *sk; |
23691d75 | 1205 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
1206 | |
1207 | BT_DBG(""); | |
1208 | ||
1209 | /* Check if we have socket listening on cid */ | |
23691d75 | 1210 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
c2287681 | 1211 | conn->src, conn->dst); |
23691d75 | 1212 | if (!pchan) |
b62f328b VT |
1213 | return; |
1214 | ||
23691d75 GP |
1215 | parent = pchan->sk; |
1216 | ||
aa2ac881 | 1217 | lock_sock(parent); |
62f3a2cf | 1218 | |
b62f328b VT |
1219 | /* Check for backlog size */ |
1220 | if (sk_acceptq_is_full(parent)) { | |
1221 | BT_DBG("backlog full %d", parent->sk_ack_backlog); | |
1222 | goto clean; | |
1223 | } | |
1224 | ||
80808e43 GP |
1225 | chan = pchan->ops->new_connection(pchan->data); |
1226 | if (!chan) | |
b62f328b VT |
1227 | goto clean; |
1228 | ||
80808e43 | 1229 | sk = chan->sk; |
5d41ce1d | 1230 | |
b62f328b VT |
1231 | hci_conn_hold(conn->hcon); |
1232 | ||
b62f328b VT |
1233 | bacpy(&bt_sk(sk)->src, conn->src); |
1234 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
1235 | ||
d1010240 GP |
1236 | bt_accept_enqueue(parent, sk); |
1237 | ||
3d57dc68 | 1238 | l2cap_chan_add(conn, chan); |
48454079 | 1239 | |
c9b66675 | 1240 | __set_chan_timer(chan, sk->sk_sndtimeo); |
b62f328b | 1241 | |
0e587be7 | 1242 | __l2cap_state_change(chan, BT_CONNECTED); |
b62f328b VT |
1243 | parent->sk_data_ready(parent, 0); |
1244 | ||
b62f328b | 1245 | clean: |
aa2ac881 | 1246 | release_sock(parent); |
b62f328b VT |
1247 | } |
1248 | ||
4e8402a3 MH |
1249 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1250 | { | |
48454079 | 1251 | struct l2cap_chan *chan; |
4e8402a3 | 1252 | |
79d554a6 | 1253 | BT_DBG("conn %p", conn); |
4e8402a3 | 1254 | |
b62f328b VT |
1255 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
1256 | l2cap_le_conn_ready(conn); | |
1257 | ||
160dc6ac VCG |
1258 | if (conn->hcon->out && conn->hcon->type == LE_LINK) |
1259 | smp_conn_security(conn, conn->hcon->pending_sec_level); | |
1260 | ||
3df91ea2 | 1261 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1262 | |
3df91ea2 | 1263 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1264 | |
6be36555 | 1265 | l2cap_chan_lock(chan); |
4e8402a3 | 1266 | |
63128451 | 1267 | if (conn->hcon->type == LE_LINK) { |
b501d6a1 | 1268 | if (smp_conn_security(conn, chan->sec_level)) |
cf4cd009 | 1269 | l2cap_chan_ready(chan); |
acd7d370 | 1270 | |
63128451 | 1271 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1272 | struct sock *sk = chan->sk; |
c9b66675 | 1273 | __clear_chan_timer(chan); |
6be36555 | 1274 | lock_sock(sk); |
0e587be7 | 1275 | __l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1276 | sk->sk_state_change(sk); |
6be36555 | 1277 | release_sock(sk); |
b501d6a1 | 1278 | |
89bc500e | 1279 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 1280 | l2cap_do_start(chan); |
4e8402a3 | 1281 | |
6be36555 | 1282 | l2cap_chan_unlock(chan); |
4e8402a3 | 1283 | } |
79d554a6 | 1284 | |
3df91ea2 | 1285 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1286 | } |
1287 | ||
1288 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1289 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1290 | { | |
48454079 | 1291 | struct l2cap_chan *chan; |
4e8402a3 MH |
1292 | |
1293 | BT_DBG("conn %p", conn); | |
1294 | ||
3df91ea2 | 1295 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1296 | |
3df91ea2 | 1297 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1298 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
2e0052e4 | 1299 | __l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1300 | } |
1301 | ||
3df91ea2 | 1302 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1303 | } |
1304 | ||
f878fcad | 1305 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1306 | { |
f878fcad | 1307 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
030013d8 | 1308 | info_timer.work); |
4e8402a3 | 1309 | |
984947dc | 1310 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1311 | conn->info_ident = 0; |
984947dc | 1312 | |
4e8402a3 MH |
1313 | l2cap_conn_start(conn); |
1314 | } | |
1315 | ||
5d3de7df VCG |
1316 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1317 | { | |
1318 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1319 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1320 | |
1321 | if (!conn) | |
1322 | return; | |
1323 | ||
1324 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1325 | ||
1326 | kfree_skb(conn->rx_skb); | |
1327 | ||
3df91ea2 AE |
1328 | mutex_lock(&conn->chan_lock); |
1329 | ||
5d3de7df VCG |
1330 | /* Kill channels */ |
1331 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1332 | l2cap_chan_hold(chan); |
6be36555 AE |
1333 | l2cap_chan_lock(chan); |
1334 | ||
5d3de7df | 1335 | l2cap_chan_del(chan, err); |
6be36555 AE |
1336 | |
1337 | l2cap_chan_unlock(chan); | |
1338 | ||
5d3de7df | 1339 | chan->ops->close(chan->data); |
61d6ef3e | 1340 | l2cap_chan_put(chan); |
5d3de7df VCG |
1341 | } |
1342 | ||
3df91ea2 AE |
1343 | mutex_unlock(&conn->chan_lock); |
1344 | ||
73d80deb LAD |
1345 | hci_chan_del(conn->hchan); |
1346 | ||
5d3de7df | 1347 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1348 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1349 | |
51a8efd7 | 1350 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1351 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1352 | smp_chan_destroy(conn); |
d26a2345 | 1353 | } |
5d3de7df VCG |
1354 | |
1355 | hcon->l2cap_data = NULL; | |
1356 | kfree(conn); | |
1357 | } | |
1358 | ||
6c9d42a1 | 1359 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1360 | { |
6c9d42a1 GP |
1361 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
1362 | security_timer.work); | |
5d3de7df VCG |
1363 | |
1364 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1365 | } | |
1366 | ||
1da177e4 LT |
1367 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1368 | { | |
0139418c | 1369 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1370 | struct hci_chan *hchan; |
1da177e4 | 1371 | |
0139418c | 1372 | if (conn || status) |
1da177e4 LT |
1373 | return conn; |
1374 | ||
73d80deb LAD |
1375 | hchan = hci_chan_create(hcon); |
1376 | if (!hchan) | |
1377 | return NULL; | |
1378 | ||
0139418c | 1379 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
73d80deb LAD |
1380 | if (!conn) { |
1381 | hci_chan_del(hchan); | |
1da177e4 | 1382 | return NULL; |
73d80deb | 1383 | } |
1da177e4 LT |
1384 | |
1385 | hcon->l2cap_data = conn; | |
1386 | conn->hcon = hcon; | |
73d80deb | 1387 | conn->hchan = hchan; |
1da177e4 | 1388 | |
73d80deb | 1389 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1390 | |
acd7d370 VT |
1391 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
1392 | conn->mtu = hcon->hdev->le_mtu; | |
1393 | else | |
1394 | conn->mtu = hcon->hdev->acl_mtu; | |
1395 | ||
1da177e4 LT |
1396 | conn->src = &hcon->hdev->bdaddr; |
1397 | conn->dst = &hcon->dst; | |
1398 | ||
4e8402a3 MH |
1399 | conn->feat_mask = 0; |
1400 | ||
1da177e4 | 1401 | spin_lock_init(&conn->lock); |
3df91ea2 | 1402 | mutex_init(&conn->chan_lock); |
baa7e1fa GP |
1403 | |
1404 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1405 | |
5d3de7df | 1406 | if (hcon->type == LE_LINK) |
6c9d42a1 | 1407 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
5d3de7df | 1408 | else |
030013d8 | 1409 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
45054dc1 | 1410 | |
9f5a0d7b | 1411 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1412 | |
1da177e4 LT |
1413 | return conn; |
1414 | } | |
1415 | ||
1da177e4 | 1416 | /* ---- Socket interface ---- */ |
1da177e4 | 1417 | |
c2287681 | 1418 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1419 | * Returns closest match. |
1420 | */ | |
c2287681 IY |
1421 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1422 | bdaddr_t *src, | |
1423 | bdaddr_t *dst) | |
1da177e4 | 1424 | { |
23691d75 | 1425 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1426 | |
23691d75 | 1427 | read_lock(&chan_list_lock); |
e0f0cb56 | 1428 | |
23691d75 GP |
1429 | list_for_each_entry(c, &chan_list, global_l) { |
1430 | struct sock *sk = c->sk; | |
fe4128e0 | 1431 | |
89bc500e | 1432 | if (state && c->state != state) |
1da177e4 LT |
1433 | continue; |
1434 | ||
23691d75 | 1435 | if (c->psm == psm) { |
c2287681 IY |
1436 | int src_match, dst_match; |
1437 | int src_any, dst_any; | |
1438 | ||
1da177e4 | 1439 | /* Exact match. */ |
c2287681 IY |
1440 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1441 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1442 | if (src_match && dst_match) { | |
a7567b20 | 1443 | read_unlock(&chan_list_lock); |
23691d75 GP |
1444 | return c; |
1445 | } | |
1da177e4 LT |
1446 | |
1447 | /* Closest match */ | |
c2287681 IY |
1448 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1449 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1450 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1451 | (src_any && dst_any)) | |
23691d75 | 1452 | c1 = c; |
1da177e4 LT |
1453 | } |
1454 | } | |
1da177e4 | 1455 | |
23691d75 | 1456 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1457 | |
23691d75 | 1458 | return c1; |
1da177e4 LT |
1459 | } |
1460 | ||
8e9f9892 AG |
1461 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, |
1462 | bdaddr_t *dst, u8 dst_type) | |
1da177e4 | 1463 | { |
5d41ce1d | 1464 | struct sock *sk = chan->sk; |
1da177e4 | 1465 | bdaddr_t *src = &bt_sk(sk)->src; |
1da177e4 LT |
1466 | struct l2cap_conn *conn; |
1467 | struct hci_conn *hcon; | |
1468 | struct hci_dev *hdev; | |
09ab6f4c | 1469 | __u8 auth_type; |
44d0e48e | 1470 | int err; |
1da177e4 | 1471 | |
8e9f9892 AG |
1472 | BT_DBG("%s -> %s (type %u) psm 0x%2.2x", batostr(src), batostr(dst), |
1473 | dst_type, __le16_to_cpu(chan->psm)); | |
1da177e4 | 1474 | |
af05b30b GP |
1475 | hdev = hci_get_route(dst, src); |
1476 | if (!hdev) | |
1da177e4 LT |
1477 | return -EHOSTUNREACH; |
1478 | ||
09fd0de5 | 1479 | hci_dev_lock(hdev); |
1da177e4 | 1480 | |
6be36555 | 1481 | l2cap_chan_lock(chan); |
03a00194 GP |
1482 | |
1483 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1484 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
1485 | chan->chan_type != L2CAP_CHAN_RAW) { | |
1486 | err = -EINVAL; | |
1487 | goto done; | |
1488 | } | |
1489 | ||
1490 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1491 | err = -EINVAL; | |
1492 | goto done; | |
1493 | } | |
1494 | ||
1495 | switch (chan->mode) { | |
1496 | case L2CAP_MODE_BASIC: | |
1497 | break; | |
1498 | case L2CAP_MODE_ERTM: | |
1499 | case L2CAP_MODE_STREAMING: | |
1500 | if (!disable_ertm) | |
1501 | break; | |
1502 | /* fall through */ | |
1503 | default: | |
1504 | err = -ENOTSUPP; | |
1505 | goto done; | |
1506 | } | |
1507 | ||
6be36555 AE |
1508 | lock_sock(sk); |
1509 | ||
03a00194 GP |
1510 | switch (sk->sk_state) { |
1511 | case BT_CONNECT: | |
1512 | case BT_CONNECT2: | |
1513 | case BT_CONFIG: | |
1514 | /* Already connecting */ | |
1515 | err = 0; | |
6be36555 | 1516 | release_sock(sk); |
03a00194 GP |
1517 | goto done; |
1518 | ||
1519 | case BT_CONNECTED: | |
1520 | /* Already connected */ | |
1521 | err = -EISCONN; | |
6be36555 | 1522 | release_sock(sk); |
03a00194 GP |
1523 | goto done; |
1524 | ||
1525 | case BT_OPEN: | |
1526 | case BT_BOUND: | |
1527 | /* Can connect */ | |
1528 | break; | |
1529 | ||
1530 | default: | |
1531 | err = -EBADFD; | |
6be36555 | 1532 | release_sock(sk); |
03a00194 GP |
1533 | goto done; |
1534 | } | |
1535 | ||
1536 | /* Set destination address and psm */ | |
9219b2a0 | 1537 | bacpy(&bt_sk(sk)->dst, dst); |
6be36555 AE |
1538 | |
1539 | release_sock(sk); | |
1540 | ||
03a00194 GP |
1541 | chan->psm = psm; |
1542 | chan->dcid = cid; | |
1da177e4 | 1543 | |
4343478f | 1544 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1545 | |
fe4128e0 | 1546 | if (chan->dcid == L2CAP_CID_LE_DATA) |
8e9f9892 | 1547 | hcon = hci_connect(hdev, LE_LINK, dst, dst_type, |
b12f62cf | 1548 | chan->sec_level, auth_type); |
acd7d370 | 1549 | else |
8e9f9892 | 1550 | hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, |
b12f62cf | 1551 | chan->sec_level, auth_type); |
acd7d370 | 1552 | |
30e76272 VT |
1553 | if (IS_ERR(hcon)) { |
1554 | err = PTR_ERR(hcon); | |
1da177e4 | 1555 | goto done; |
30e76272 | 1556 | } |
1da177e4 LT |
1557 | |
1558 | conn = l2cap_conn_add(hcon, 0); | |
1559 | if (!conn) { | |
1560 | hci_conn_put(hcon); | |
30e76272 | 1561 | err = -ENOMEM; |
1da177e4 LT |
1562 | goto done; |
1563 | } | |
1564 | ||
9f0caeb1 VCG |
1565 | if (hcon->type == LE_LINK) { |
1566 | err = 0; | |
1567 | ||
1568 | if (!list_empty(&conn->chan_l)) { | |
1569 | err = -EBUSY; | |
1570 | hci_conn_put(hcon); | |
1571 | } | |
1572 | ||
1573 | if (err) | |
1574 | goto done; | |
1575 | } | |
1576 | ||
1da177e4 LT |
1577 | /* Update source addr of the socket */ |
1578 | bacpy(src, conn->src); | |
1579 | ||
6be36555 | 1580 | l2cap_chan_unlock(chan); |
48454079 | 1581 | l2cap_chan_add(conn, chan); |
6be36555 | 1582 | l2cap_chan_lock(chan); |
48454079 | 1583 | |
6be36555 | 1584 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1585 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1586 | |
1587 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1588 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1589 | __clear_chan_timer(chan); |
d45fc423 | 1590 | if (l2cap_chan_check_security(chan)) |
6be36555 | 1591 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1592 | } else |
fc7f8a7e | 1593 | l2cap_do_start(chan); |
1da177e4 LT |
1594 | } |
1595 | ||
30e76272 VT |
1596 | err = 0; |
1597 | ||
1da177e4 | 1598 | done: |
6be36555 | 1599 | l2cap_chan_unlock(chan); |
09fd0de5 | 1600 | hci_dev_unlock(hdev); |
1da177e4 LT |
1601 | hci_dev_put(hdev); |
1602 | return err; | |
1603 | } | |
1604 | ||
dcba0dba | 1605 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1606 | { |
8c1d787b | 1607 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1608 | DECLARE_WAITQUEUE(wait, current); |
1609 | int err = 0; | |
1610 | int timeo = HZ/5; | |
1611 | ||
2b0b05dd | 1612 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1613 | set_current_state(TASK_INTERRUPTIBLE); |
1614 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1615 | if (!timeo) |
1616 | timeo = HZ/5; | |
1617 | ||
1618 | if (signal_pending(current)) { | |
1619 | err = sock_intr_errno(timeo); | |
1620 | break; | |
1621 | } | |
1622 | ||
1623 | release_sock(sk); | |
1624 | timeo = schedule_timeout(timeo); | |
1625 | lock_sock(sk); | |
a71a0cf4 | 1626 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1627 | |
1628 | err = sock_error(sk); | |
1629 | if (err) | |
1630 | break; | |
1631 | } | |
1632 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1633 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1634 | return err; |
1635 | } | |
1636 | ||
721c4181 | 1637 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1638 | { |
721c4181 | 1639 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1640 | monitor_timer.work); |
e90bac06 | 1641 | |
525cd185 | 1642 | BT_DBG("chan %p", chan); |
0e98958d | 1643 | |
6be36555 AE |
1644 | l2cap_chan_lock(chan); |
1645 | ||
2c03a7a4 | 1646 | if (chan->retry_count >= chan->remote_max_tx) { |
8c1d787b | 1647 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
6be36555 | 1648 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1649 | l2cap_chan_put(chan); |
e90bac06 GP |
1650 | return; |
1651 | } | |
1652 | ||
6a026610 | 1653 | chan->retry_count++; |
1a09bcb9 | 1654 | __set_monitor_timer(chan); |
e90bac06 | 1655 | |
525cd185 | 1656 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
6be36555 | 1657 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1658 | l2cap_chan_put(chan); |
e90bac06 GP |
1659 | } |
1660 | ||
721c4181 | 1661 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1662 | { |
721c4181 | 1663 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1664 | retrans_timer.work); |
e90bac06 | 1665 | |
49208c9c | 1666 | BT_DBG("chan %p", chan); |
0e98958d | 1667 | |
6be36555 AE |
1668 | l2cap_chan_lock(chan); |
1669 | ||
6a026610 | 1670 | chan->retry_count = 1; |
1a09bcb9 | 1671 | __set_monitor_timer(chan); |
e90bac06 | 1672 | |
e2ab4353 | 1673 | set_bit(CONN_WAIT_F, &chan->conn_state); |
e90bac06 | 1674 | |
525cd185 | 1675 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
6be36555 AE |
1676 | |
1677 | l2cap_chan_unlock(chan); | |
8d7e1c7f | 1678 | l2cap_chan_put(chan); |
e90bac06 GP |
1679 | } |
1680 | ||
3733937d MM |
1681 | static int l2cap_streaming_send(struct l2cap_chan *chan, |
1682 | struct sk_buff_head *skbs) | |
6840ed07 | 1683 | { |
ccbb84af | 1684 | struct sk_buff *skb; |
3733937d | 1685 | struct l2cap_ctrl *control; |
6840ed07 | 1686 | |
3733937d MM |
1687 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1688 | ||
1689 | if (chan->state != BT_CONNECTED) | |
1690 | return -ENOTCONN; | |
1691 | ||
1692 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
1693 | ||
1694 | while (!skb_queue_empty(&chan->tx_q)) { | |
1695 | ||
1696 | skb = skb_dequeue(&chan->tx_q); | |
1697 | ||
1698 | bt_cb(skb)->control.retries = 1; | |
1699 | control = &bt_cb(skb)->control; | |
1700 | ||
1701 | control->reqseq = 0; | |
1702 | control->txseq = chan->next_tx_seq; | |
1703 | ||
1704 | __pack_control(chan, control, skb); | |
6840ed07 | 1705 | |
47d1ec61 | 1706 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1707 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1708 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1709 | } |
1710 | ||
4343478f | 1711 | l2cap_do_send(chan, skb); |
6840ed07 | 1712 | |
3733937d MM |
1713 | BT_DBG("Sent txseq %d", (int)control->txseq); |
1714 | ||
836be934 | 1715 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1716 | chan->frames_sent++; |
6840ed07 | 1717 | } |
3733937d MM |
1718 | |
1719 | return 0; | |
6840ed07 GP |
1720 | } |
1721 | ||
67c9e840 | 1722 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1723 | { |
1724 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1725 | struct l2cap_ctrl *control; |
1726 | int sent = 0; | |
1727 | ||
1728 | BT_DBG("chan %p", chan); | |
1c2acffb | 1729 | |
89bc500e | 1730 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1731 | return -ENOTCONN; |
e90bac06 | 1732 | |
94122bbe MM |
1733 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1734 | return 0; | |
1735 | ||
18a48e76 MM |
1736 | while (chan->tx_send_head && |
1737 | chan->unacked_frames < chan->remote_tx_win && | |
1738 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1739 | |
18a48e76 | 1740 | skb = chan->tx_send_head; |
e90bac06 | 1741 | |
18a48e76 MM |
1742 | bt_cb(skb)->control.retries = 1; |
1743 | control = &bt_cb(skb)->control; | |
95ffa978 | 1744 | |
e2ab4353 | 1745 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1746 | control->final = 1; |
e2ab4353 | 1747 | |
18a48e76 MM |
1748 | control->reqseq = chan->buffer_seq; |
1749 | chan->last_acked_seq = chan->buffer_seq; | |
1750 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1751 | |
18a48e76 | 1752 | __pack_control(chan, control, skb); |
e90bac06 | 1753 | |
47d1ec61 | 1754 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
1755 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1756 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1757 | } |
1758 | ||
18a48e76 MM |
1759 | /* Clone after data has been modified. Data is assumed to be |
1760 | read-only (for locking purposes) on cloned sk_buffs. | |
1761 | */ | |
1762 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 1763 | |
18a48e76 MM |
1764 | if (!tx_skb) |
1765 | break; | |
1c2acffb | 1766 | |
18a48e76 | 1767 | __set_retrans_timer(chan); |
836be934 AE |
1768 | |
1769 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 1770 | chan->unacked_frames++; |
6a026610 | 1771 | chan->frames_sent++; |
18a48e76 | 1772 | sent++; |
1c2acffb | 1773 | |
58d35f87 GP |
1774 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1775 | chan->tx_send_head = NULL; | |
1c2acffb | 1776 | else |
58d35f87 | 1777 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
1778 | |
1779 | l2cap_do_send(chan, tx_skb); | |
1780 | BT_DBG("Sent txseq %d", (int)control->txseq); | |
1c2acffb GP |
1781 | } |
1782 | ||
18a48e76 MM |
1783 | BT_DBG("Sent %d, %d unacked, %d in ERTM queue", sent, |
1784 | (int) chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
1785 | ||
1786 | return sent; | |
9e917af1 GP |
1787 | } |
1788 | ||
e1fbd4c1 MM |
1789 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
1790 | { | |
1791 | struct l2cap_ctrl control; | |
1792 | struct sk_buff *skb; | |
1793 | struct sk_buff *tx_skb; | |
1794 | u16 seq; | |
1795 | ||
1796 | BT_DBG("chan %p", chan); | |
1797 | ||
1798 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1799 | return; | |
1800 | ||
1801 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { | |
1802 | seq = l2cap_seq_list_pop(&chan->retrans_list); | |
1803 | ||
1804 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); | |
1805 | if (!skb) { | |
1806 | BT_DBG("Error: Can't retransmit seq %d, frame missing", | |
1807 | seq); | |
1808 | continue; | |
1809 | } | |
1810 | ||
1811 | bt_cb(skb)->control.retries++; | |
1812 | control = bt_cb(skb)->control; | |
1813 | ||
1814 | if (chan->max_tx != 0 && | |
1815 | bt_cb(skb)->control.retries > chan->max_tx) { | |
1816 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
1817 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
1818 | l2cap_seq_list_clear(&chan->retrans_list); | |
1819 | break; | |
1820 | } | |
1821 | ||
1822 | control.reqseq = chan->buffer_seq; | |
1823 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
1824 | control.final = 1; | |
1825 | else | |
1826 | control.final = 0; | |
1827 | ||
1828 | if (skb_cloned(skb)) { | |
1829 | /* Cloned sk_buffs are read-only, so we need a | |
1830 | * writeable copy | |
1831 | */ | |
1832 | tx_skb = skb_copy(skb, GFP_ATOMIC); | |
1833 | } else { | |
1834 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1835 | } | |
1836 | ||
1837 | if (!tx_skb) { | |
1838 | l2cap_seq_list_clear(&chan->retrans_list); | |
1839 | break; | |
1840 | } | |
1841 | ||
1842 | /* Update skb contents */ | |
1843 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
1844 | put_unaligned_le32(__pack_extended_control(&control), | |
1845 | tx_skb->data + L2CAP_HDR_SIZE); | |
1846 | } else { | |
1847 | put_unaligned_le16(__pack_enhanced_control(&control), | |
1848 | tx_skb->data + L2CAP_HDR_SIZE); | |
1849 | } | |
1850 | ||
1851 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
1852 | u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); | |
1853 | put_unaligned_le16(fcs, skb_put(tx_skb, | |
1854 | L2CAP_FCS_SIZE)); | |
1855 | } | |
1856 | ||
1857 | l2cap_do_send(chan, tx_skb); | |
1858 | ||
1859 | BT_DBG("Resent txseq %d", control.txseq); | |
1860 | ||
1861 | chan->last_acked_seq = chan->buffer_seq; | |
1862 | } | |
1863 | } | |
1864 | ||
f80842a8 MM |
1865 | static void l2cap_retransmit(struct l2cap_chan *chan, |
1866 | struct l2cap_ctrl *control) | |
1867 | { | |
1868 | BT_DBG("chan %p, control %p", chan, control); | |
1869 | ||
1870 | l2cap_seq_list_append(&chan->retrans_list, control->reqseq); | |
1871 | l2cap_ertm_resend(chan); | |
1872 | } | |
1873 | ||
d2a7ac5d MM |
1874 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
1875 | struct l2cap_ctrl *control) | |
1876 | { | |
e1fbd4c1 MM |
1877 | struct sk_buff *skb; |
1878 | ||
1879 | BT_DBG("chan %p, control %p", chan, control); | |
1880 | ||
1881 | if (control->poll) | |
1882 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
1883 | ||
1884 | l2cap_seq_list_clear(&chan->retrans_list); | |
1885 | ||
1886 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1887 | return; | |
1888 | ||
1889 | if (chan->unacked_frames) { | |
1890 | skb_queue_walk(&chan->tx_q, skb) { | |
1891 | if (bt_cb(skb)->control.txseq == control->reqseq || | |
1892 | skb == chan->tx_send_head) | |
1893 | break; | |
1894 | } | |
1895 | ||
1896 | skb_queue_walk_from(&chan->tx_q, skb) { | |
1897 | if (skb == chan->tx_send_head) | |
1898 | break; | |
1899 | ||
1900 | l2cap_seq_list_append(&chan->retrans_list, | |
1901 | bt_cb(skb)->control.txseq); | |
1902 | } | |
1903 | ||
1904 | l2cap_ertm_resend(chan); | |
1905 | } | |
d2a7ac5d MM |
1906 | } |
1907 | ||
0a0aba42 | 1908 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1909 | { |
0a0aba42 MM |
1910 | struct l2cap_ctrl control; |
1911 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
1912 | chan->last_acked_seq); | |
1913 | int threshold; | |
9e917af1 | 1914 | |
0a0aba42 MM |
1915 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
1916 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 1917 | |
0a0aba42 MM |
1918 | memset(&control, 0, sizeof(control)); |
1919 | control.sframe = 1; | |
dfc909be | 1920 | |
0a0aba42 MM |
1921 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
1922 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
1923 | __clear_ack_timer(chan); | |
1924 | control.super = L2CAP_SUPER_RNR; | |
1925 | control.reqseq = chan->buffer_seq; | |
1926 | l2cap_send_sframe(chan, &control); | |
1927 | } else { | |
1928 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
1929 | l2cap_ertm_send(chan); | |
1930 | /* If any i-frames were sent, they included an ack */ | |
1931 | if (chan->buffer_seq == chan->last_acked_seq) | |
1932 | frames_to_ack = 0; | |
1933 | } | |
dfc909be | 1934 | |
0a0aba42 MM |
1935 | /* Ack now if the tx window is 3/4ths full. |
1936 | * Calculate without mul or div | |
1937 | */ | |
1938 | threshold = chan->tx_win; | |
1939 | threshold += threshold << 1; | |
1940 | threshold >>= 2; | |
1941 | ||
1942 | BT_DBG("frames_to_ack %d, threshold %d", (int)frames_to_ack, | |
1943 | threshold); | |
1944 | ||
1945 | if (frames_to_ack >= threshold) { | |
1946 | __clear_ack_timer(chan); | |
1947 | control.super = L2CAP_SUPER_RR; | |
1948 | control.reqseq = chan->buffer_seq; | |
1949 | l2cap_send_sframe(chan, &control); | |
1950 | frames_to_ack = 0; | |
1951 | } | |
1c2acffb | 1952 | |
0a0aba42 MM |
1953 | if (frames_to_ack) |
1954 | __set_ack_timer(chan); | |
1955 | } | |
b17e73bb SJ |
1956 | } |
1957 | ||
04124681 GP |
1958 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
1959 | struct msghdr *msg, int len, | |
1960 | int count, struct sk_buff *skb) | |
1c2acffb | 1961 | { |
0952a57a | 1962 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1963 | struct sk_buff **frag; |
90338947 | 1964 | int sent = 0; |
1da177e4 | 1965 | |
59203a21 | 1966 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1967 | return -EFAULT; |
1da177e4 LT |
1968 | |
1969 | sent += count; | |
1970 | len -= count; | |
1971 | ||
1972 | /* Continuation fragments (no L2CAP header) */ | |
1973 | frag = &skb_shinfo(skb)->frag_list; | |
1974 | while (len) { | |
fbe00700 GP |
1975 | struct sk_buff *tmp; |
1976 | ||
1da177e4 LT |
1977 | count = min_t(unsigned int, conn->mtu, len); |
1978 | ||
fbe00700 GP |
1979 | tmp = chan->ops->alloc_skb(chan, count, |
1980 | msg->msg_flags & MSG_DONTWAIT); | |
1981 | if (IS_ERR(tmp)) | |
1982 | return PTR_ERR(tmp); | |
1983 | ||
1984 | *frag = tmp; | |
2f7719ce | 1985 | |
1c2acffb GP |
1986 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1987 | return -EFAULT; | |
1da177e4 | 1988 | |
5e59b791 LAD |
1989 | (*frag)->priority = skb->priority; |
1990 | ||
1da177e4 LT |
1991 | sent += count; |
1992 | len -= count; | |
1993 | ||
2d0ed3d5 GP |
1994 | skb->len += (*frag)->len; |
1995 | skb->data_len += (*frag)->len; | |
1996 | ||
1da177e4 LT |
1997 | frag = &(*frag)->next; |
1998 | } | |
1da177e4 LT |
1999 | |
2000 | return sent; | |
1c2acffb | 2001 | } |
1da177e4 | 2002 | |
5e59b791 LAD |
2003 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
2004 | struct msghdr *msg, size_t len, | |
2005 | u32 priority) | |
1c2acffb | 2006 | { |
8c1d787b | 2007 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2008 | struct sk_buff *skb; |
03a51213 | 2009 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
2010 | struct l2cap_hdr *lh; |
2011 | ||
6d5922b0 | 2012 | BT_DBG("chan %p len %d priority %u", chan, (int)len, priority); |
1c2acffb GP |
2013 | |
2014 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
2015 | |
2016 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2017 | msg->msg_flags & MSG_DONTWAIT); |
2018 | if (IS_ERR(skb)) | |
2019 | return skb; | |
1c2acffb | 2020 | |
5e59b791 LAD |
2021 | skb->priority = priority; |
2022 | ||
1c2acffb GP |
2023 | /* Create L2CAP header */ |
2024 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2025 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c AE |
2026 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
2027 | put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); | |
1c2acffb | 2028 | |
0952a57a | 2029 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2030 | if (unlikely(err < 0)) { |
2031 | kfree_skb(skb); | |
2032 | return ERR_PTR(err); | |
2033 | } | |
2034 | return skb; | |
2035 | } | |
2036 | ||
5e59b791 LAD |
2037 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
2038 | struct msghdr *msg, size_t len, | |
2039 | u32 priority) | |
1c2acffb | 2040 | { |
8c1d787b | 2041 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2042 | struct sk_buff *skb; |
f2ba7fae | 2043 | int err, count; |
1c2acffb GP |
2044 | struct l2cap_hdr *lh; |
2045 | ||
6d5922b0 | 2046 | BT_DBG("chan %p len %d", chan, (int)len); |
1c2acffb | 2047 | |
f2ba7fae | 2048 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 2049 | |
f2ba7fae | 2050 | skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, |
90338947 GP |
2051 | msg->msg_flags & MSG_DONTWAIT); |
2052 | if (IS_ERR(skb)) | |
2053 | return skb; | |
1c2acffb | 2054 | |
5e59b791 LAD |
2055 | skb->priority = priority; |
2056 | ||
1c2acffb GP |
2057 | /* Create L2CAP header */ |
2058 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2059 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 2060 | lh->len = cpu_to_le16(len); |
1c2acffb | 2061 | |
0952a57a | 2062 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2063 | if (unlikely(err < 0)) { |
2064 | kfree_skb(skb); | |
2065 | return ERR_PTR(err); | |
2066 | } | |
2067 | return skb; | |
2068 | } | |
2069 | ||
ab0ff76d LAD |
2070 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
2071 | struct msghdr *msg, size_t len, | |
94122bbe | 2072 | u16 sdulen) |
1c2acffb | 2073 | { |
8c1d787b | 2074 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2075 | struct sk_buff *skb; |
e4ca6d98 | 2076 | int err, count, hlen; |
1c2acffb GP |
2077 | struct l2cap_hdr *lh; |
2078 | ||
6d5922b0 | 2079 | BT_DBG("chan %p len %d", chan, (int)len); |
1c2acffb | 2080 | |
0ee0d208 GP |
2081 | if (!conn) |
2082 | return ERR_PTR(-ENOTCONN); | |
2083 | ||
e4ca6d98 AE |
2084 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
2085 | hlen = L2CAP_EXT_HDR_SIZE; | |
2086 | else | |
2087 | hlen = L2CAP_ENH_HDR_SIZE; | |
2088 | ||
c74e560c | 2089 | if (sdulen) |
03a51213 | 2090 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2091 | |
47d1ec61 | 2092 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2093 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2094 | |
1c2acffb | 2095 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce AE |
2096 | |
2097 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2098 | msg->msg_flags & MSG_DONTWAIT); |
2099 | if (IS_ERR(skb)) | |
2100 | return skb; | |
1c2acffb GP |
2101 | |
2102 | /* Create L2CAP header */ | |
2103 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2104 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2105 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2106 | |
18a48e76 MM |
2107 | /* Control header is populated later */ |
2108 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2109 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2110 | else | |
2111 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2112 | |
c74e560c | 2113 | if (sdulen) |
03a51213 | 2114 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2115 | |
0952a57a | 2116 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2117 | if (unlikely(err < 0)) { |
2118 | kfree_skb(skb); | |
2119 | return ERR_PTR(err); | |
2120 | } | |
e90bac06 | 2121 | |
18a48e76 | 2122 | bt_cb(skb)->control.fcs = chan->fcs; |
3ce3514f | 2123 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 2124 | return skb; |
1da177e4 LT |
2125 | } |
2126 | ||
94122bbe MM |
2127 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2128 | struct sk_buff_head *seg_queue, | |
2129 | struct msghdr *msg, size_t len) | |
c74e560c | 2130 | { |
c74e560c | 2131 | struct sk_buff *skb; |
94122bbe MM |
2132 | u16 sdu_len; |
2133 | size_t pdu_len; | |
2134 | int err = 0; | |
2135 | u8 sar; | |
c74e560c | 2136 | |
94122bbe | 2137 | BT_DBG("chan %p, msg %p, len %d", chan, msg, (int)len); |
c74e560c | 2138 | |
94122bbe MM |
2139 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2140 | * so fragmented skbs are not used. The HCI layer's handling | |
2141 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2142 | */ | |
c74e560c | 2143 | |
94122bbe MM |
2144 | /* PDU size is derived from the HCI MTU */ |
2145 | pdu_len = chan->conn->mtu; | |
c74e560c | 2146 | |
94122bbe MM |
2147 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); |
2148 | ||
2149 | /* Adjust for largest possible L2CAP overhead. */ | |
2150 | pdu_len -= L2CAP_EXT_HDR_SIZE + L2CAP_FCS_SIZE; | |
2151 | ||
2152 | /* Remote device may have requested smaller PDUs */ | |
2153 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2154 | ||
2155 | if (len <= pdu_len) { | |
2156 | sar = L2CAP_SAR_UNSEGMENTED; | |
2157 | sdu_len = 0; | |
2158 | pdu_len = len; | |
2159 | } else { | |
2160 | sar = L2CAP_SAR_START; | |
2161 | sdu_len = len; | |
2162 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2163 | } | |
2164 | ||
2165 | while (len > 0) { | |
2166 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2167 | |
c74e560c | 2168 | if (IS_ERR(skb)) { |
94122bbe | 2169 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2170 | return PTR_ERR(skb); |
2171 | } | |
2172 | ||
94122bbe MM |
2173 | bt_cb(skb)->control.sar = sar; |
2174 | __skb_queue_tail(seg_queue, skb); | |
2175 | ||
2176 | len -= pdu_len; | |
2177 | if (sdu_len) { | |
2178 | sdu_len = 0; | |
2179 | pdu_len += L2CAP_SDULEN_SIZE; | |
2180 | } | |
2181 | ||
2182 | if (len <= pdu_len) { | |
2183 | sar = L2CAP_SAR_END; | |
2184 | pdu_len = len; | |
2185 | } else { | |
2186 | sar = L2CAP_SAR_CONTINUE; | |
2187 | } | |
c74e560c | 2188 | } |
c74e560c | 2189 | |
94122bbe | 2190 | return err; |
c74e560c GP |
2191 | } |
2192 | ||
5e59b791 LAD |
2193 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
2194 | u32 priority) | |
9a91a04a | 2195 | { |
9a91a04a | 2196 | struct sk_buff *skb; |
9a91a04a | 2197 | int err; |
94122bbe | 2198 | struct sk_buff_head seg_queue; |
9a91a04a GP |
2199 | |
2200 | /* Connectionless channel */ | |
715ec005 | 2201 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 2202 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
2203 | if (IS_ERR(skb)) |
2204 | return PTR_ERR(skb); | |
2205 | ||
2206 | l2cap_do_send(chan, skb); | |
2207 | return len; | |
2208 | } | |
2209 | ||
2210 | switch (chan->mode) { | |
2211 | case L2CAP_MODE_BASIC: | |
2212 | /* Check outgoing MTU */ | |
2213 | if (len > chan->omtu) | |
2214 | return -EMSGSIZE; | |
2215 | ||
2216 | /* Create a basic PDU */ | |
5e59b791 | 2217 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
2218 | if (IS_ERR(skb)) |
2219 | return PTR_ERR(skb); | |
2220 | ||
2221 | l2cap_do_send(chan, skb); | |
2222 | err = len; | |
2223 | break; | |
2224 | ||
2225 | case L2CAP_MODE_ERTM: | |
2226 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2227 | /* Check outgoing MTU */ |
2228 | if (len > chan->omtu) { | |
2229 | err = -EMSGSIZE; | |
2230 | break; | |
2231 | } | |
9a91a04a | 2232 | |
94122bbe | 2233 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2234 | |
94122bbe MM |
2235 | /* Do segmentation before calling in to the state machine, |
2236 | * since it's possible to block while waiting for memory | |
2237 | * allocation. | |
2238 | */ | |
2239 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2240 | |
94122bbe MM |
2241 | /* The channel could have been closed while segmenting, |
2242 | * check that it is still connected. | |
2243 | */ | |
2244 | if (chan->state != BT_CONNECTED) { | |
2245 | __skb_queue_purge(&seg_queue); | |
2246 | err = -ENOTCONN; | |
9a91a04a GP |
2247 | } |
2248 | ||
94122bbe | 2249 | if (err) |
9a91a04a | 2250 | break; |
9a91a04a | 2251 | |
3733937d | 2252 | if (chan->mode == L2CAP_MODE_ERTM) |
608bcc6d MM |
2253 | err = l2cap_tx(chan, 0, &seg_queue, |
2254 | L2CAP_EV_DATA_REQUEST); | |
3733937d MM |
2255 | else |
2256 | err = l2cap_streaming_send(chan, &seg_queue); | |
9a91a04a | 2257 | |
608bcc6d | 2258 | if (!err) |
9a91a04a GP |
2259 | err = len; |
2260 | ||
94122bbe MM |
2261 | /* If the skbs were not queued for sending, they'll still be in |
2262 | * seg_queue and need to be purged. | |
2263 | */ | |
2264 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2265 | break; |
2266 | ||
2267 | default: | |
2268 | BT_DBG("bad state %1.1x", chan->mode); | |
2269 | err = -EBADFD; | |
2270 | } | |
2271 | ||
2272 | return err; | |
2273 | } | |
2274 | ||
d2a7ac5d MM |
2275 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2276 | { | |
bed68bde MM |
2277 | struct l2cap_ctrl control; |
2278 | u16 seq; | |
2279 | ||
2280 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
2281 | ||
2282 | memset(&control, 0, sizeof(control)); | |
2283 | control.sframe = 1; | |
2284 | control.super = L2CAP_SUPER_SREJ; | |
2285 | ||
2286 | for (seq = chan->expected_tx_seq; seq != txseq; | |
2287 | seq = __next_seq(chan, seq)) { | |
2288 | if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { | |
2289 | control.reqseq = seq; | |
2290 | l2cap_send_sframe(chan, &control); | |
2291 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2292 | } | |
2293 | } | |
2294 | ||
2295 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
d2a7ac5d MM |
2296 | } |
2297 | ||
2298 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) | |
2299 | { | |
bed68bde MM |
2300 | struct l2cap_ctrl control; |
2301 | ||
2302 | BT_DBG("chan %p", chan); | |
2303 | ||
2304 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) | |
2305 | return; | |
2306 | ||
2307 | memset(&control, 0, sizeof(control)); | |
2308 | control.sframe = 1; | |
2309 | control.super = L2CAP_SUPER_SREJ; | |
2310 | control.reqseq = chan->srej_list.tail; | |
2311 | l2cap_send_sframe(chan, &control); | |
d2a7ac5d MM |
2312 | } |
2313 | ||
2314 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) | |
2315 | { | |
bed68bde MM |
2316 | struct l2cap_ctrl control; |
2317 | u16 initial_head; | |
2318 | u16 seq; | |
2319 | ||
2320 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
2321 | ||
2322 | memset(&control, 0, sizeof(control)); | |
2323 | control.sframe = 1; | |
2324 | control.super = L2CAP_SUPER_SREJ; | |
2325 | ||
2326 | /* Capture initial list head to allow only one pass through the list. */ | |
2327 | initial_head = chan->srej_list.head; | |
2328 | ||
2329 | do { | |
2330 | seq = l2cap_seq_list_pop(&chan->srej_list); | |
2331 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) | |
2332 | break; | |
2333 | ||
2334 | control.reqseq = seq; | |
2335 | l2cap_send_sframe(chan, &control); | |
2336 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2337 | } while (chan->srej_list.head != initial_head); | |
d2a7ac5d MM |
2338 | } |
2339 | ||
608bcc6d MM |
2340 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2341 | { | |
2342 | struct sk_buff *acked_skb; | |
2343 | u16 ackseq; | |
2344 | ||
2345 | BT_DBG("chan %p, reqseq %d", chan, reqseq); | |
2346 | ||
2347 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2348 | return; | |
2349 | ||
2350 | BT_DBG("expected_ack_seq %d, unacked_frames %d", | |
2351 | chan->expected_ack_seq, chan->unacked_frames); | |
2352 | ||
2353 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2354 | ackseq = __next_seq(chan, ackseq)) { | |
2355 | ||
2356 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2357 | if (acked_skb) { | |
2358 | skb_unlink(acked_skb, &chan->tx_q); | |
2359 | kfree_skb(acked_skb); | |
2360 | chan->unacked_frames--; | |
2361 | } | |
2362 | } | |
2363 | ||
2364 | chan->expected_ack_seq = reqseq; | |
2365 | ||
2366 | if (chan->unacked_frames == 0) | |
2367 | __clear_retrans_timer(chan); | |
2368 | ||
2369 | BT_DBG("unacked_frames %d", (int) chan->unacked_frames); | |
2370 | } | |
2371 | ||
2372 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2373 | { | |
2374 | BT_DBG("chan %p", chan); | |
2375 | ||
2376 | chan->expected_tx_seq = chan->buffer_seq; | |
2377 | l2cap_seq_list_clear(&chan->srej_list); | |
2378 | skb_queue_purge(&chan->srej_q); | |
2379 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2380 | } | |
2381 | ||
2382 | static int l2cap_tx_state_xmit(struct l2cap_chan *chan, | |
2383 | struct l2cap_ctrl *control, | |
2384 | struct sk_buff_head *skbs, u8 event) | |
2385 | { | |
2386 | int err = 0; | |
2387 | ||
2388 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, | |
2389 | event); | |
2390 | ||
2391 | switch (event) { | |
2392 | case L2CAP_EV_DATA_REQUEST: | |
2393 | if (chan->tx_send_head == NULL) | |
2394 | chan->tx_send_head = skb_peek(skbs); | |
2395 | ||
2396 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2397 | l2cap_ertm_send(chan); | |
2398 | break; | |
2399 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2400 | BT_DBG("Enter LOCAL_BUSY"); | |
2401 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2402 | ||
2403 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2404 | /* The SREJ_SENT state must be aborted if we are to | |
2405 | * enter the LOCAL_BUSY state. | |
2406 | */ | |
2407 | l2cap_abort_rx_srej_sent(chan); | |
2408 | } | |
2409 | ||
2410 | l2cap_send_ack(chan); | |
2411 | ||
2412 | break; | |
2413 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2414 | BT_DBG("Exit LOCAL_BUSY"); | |
2415 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2416 | ||
2417 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2418 | struct l2cap_ctrl local_control; | |
2419 | ||
2420 | memset(&local_control, 0, sizeof(local_control)); | |
2421 | local_control.sframe = 1; | |
2422 | local_control.super = L2CAP_SUPER_RR; | |
2423 | local_control.poll = 1; | |
2424 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2425 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2426 | |
2427 | chan->retry_count = 1; | |
2428 | __set_monitor_timer(chan); | |
2429 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2430 | } | |
2431 | break; | |
2432 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2433 | l2cap_process_reqseq(chan, control->reqseq); | |
2434 | break; | |
2435 | case L2CAP_EV_EXPLICIT_POLL: | |
2436 | l2cap_send_rr_or_rnr(chan, 1); | |
2437 | chan->retry_count = 1; | |
2438 | __set_monitor_timer(chan); | |
2439 | __clear_ack_timer(chan); | |
2440 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2441 | break; | |
2442 | case L2CAP_EV_RETRANS_TO: | |
2443 | l2cap_send_rr_or_rnr(chan, 1); | |
2444 | chan->retry_count = 1; | |
2445 | __set_monitor_timer(chan); | |
2446 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2447 | break; | |
2448 | case L2CAP_EV_RECV_FBIT: | |
2449 | /* Nothing to process */ | |
2450 | break; | |
2451 | default: | |
2452 | break; | |
2453 | } | |
2454 | ||
2455 | return err; | |
2456 | } | |
2457 | ||
2458 | static int l2cap_tx_state_wait_f(struct l2cap_chan *chan, | |
2459 | struct l2cap_ctrl *control, | |
2460 | struct sk_buff_head *skbs, u8 event) | |
2461 | { | |
2462 | int err = 0; | |
2463 | ||
2464 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, | |
2465 | event); | |
2466 | ||
2467 | switch (event) { | |
2468 | case L2CAP_EV_DATA_REQUEST: | |
2469 | if (chan->tx_send_head == NULL) | |
2470 | chan->tx_send_head = skb_peek(skbs); | |
2471 | /* Queue data, but don't send. */ | |
2472 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2473 | break; | |
2474 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2475 | BT_DBG("Enter LOCAL_BUSY"); | |
2476 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2477 | ||
2478 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2479 | /* The SREJ_SENT state must be aborted if we are to | |
2480 | * enter the LOCAL_BUSY state. | |
2481 | */ | |
2482 | l2cap_abort_rx_srej_sent(chan); | |
2483 | } | |
2484 | ||
2485 | l2cap_send_ack(chan); | |
2486 | ||
2487 | break; | |
2488 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2489 | BT_DBG("Exit LOCAL_BUSY"); | |
2490 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2491 | ||
2492 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2493 | struct l2cap_ctrl local_control; | |
2494 | memset(&local_control, 0, sizeof(local_control)); | |
2495 | local_control.sframe = 1; | |
2496 | local_control.super = L2CAP_SUPER_RR; | |
2497 | local_control.poll = 1; | |
2498 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2499 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2500 | |
2501 | chan->retry_count = 1; | |
2502 | __set_monitor_timer(chan); | |
2503 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2504 | } | |
2505 | break; | |
2506 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2507 | l2cap_process_reqseq(chan, control->reqseq); | |
2508 | ||
2509 | /* Fall through */ | |
2510 | ||
2511 | case L2CAP_EV_RECV_FBIT: | |
2512 | if (control && control->final) { | |
2513 | __clear_monitor_timer(chan); | |
2514 | if (chan->unacked_frames > 0) | |
2515 | __set_retrans_timer(chan); | |
2516 | chan->retry_count = 0; | |
2517 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2518 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2519 | } | |
2520 | break; | |
2521 | case L2CAP_EV_EXPLICIT_POLL: | |
2522 | /* Ignore */ | |
2523 | break; | |
2524 | case L2CAP_EV_MONITOR_TO: | |
2525 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2526 | l2cap_send_rr_or_rnr(chan, 1); | |
2527 | __set_monitor_timer(chan); | |
2528 | chan->retry_count++; | |
2529 | } else { | |
2530 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); | |
2531 | } | |
2532 | break; | |
2533 | default: | |
2534 | break; | |
2535 | } | |
2536 | ||
2537 | return err; | |
2538 | } | |
2539 | ||
2540 | static int l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
2541 | struct sk_buff_head *skbs, u8 event) | |
2542 | { | |
2543 | int err = 0; | |
2544 | ||
2545 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", | |
2546 | chan, control, skbs, event, chan->tx_state); | |
2547 | ||
2548 | switch (chan->tx_state) { | |
2549 | case L2CAP_TX_STATE_XMIT: | |
2550 | err = l2cap_tx_state_xmit(chan, control, skbs, event); | |
2551 | break; | |
2552 | case L2CAP_TX_STATE_WAIT_F: | |
2553 | err = l2cap_tx_state_wait_f(chan, control, skbs, event); | |
2554 | break; | |
2555 | default: | |
2556 | /* Ignore event */ | |
2557 | break; | |
2558 | } | |
2559 | ||
2560 | return err; | |
2561 | } | |
2562 | ||
4b51dae9 MM |
2563 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2564 | struct l2cap_ctrl *control) | |
2565 | { | |
2566 | BT_DBG("chan %p, control %p", chan, control); | |
2567 | l2cap_tx(chan, control, 0, L2CAP_EV_RECV_REQSEQ_AND_FBIT); | |
2568 | } | |
2569 | ||
f80842a8 MM |
2570 | static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
2571 | struct l2cap_ctrl *control) | |
2572 | { | |
2573 | BT_DBG("chan %p, control %p", chan, control); | |
2574 | l2cap_tx(chan, control, 0, L2CAP_EV_RECV_FBIT); | |
2575 | } | |
2576 | ||
1da177e4 LT |
2577 | /* Copy frame to all raw sockets on that connection */ |
2578 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2579 | { | |
1da177e4 | 2580 | struct sk_buff *nskb; |
48454079 | 2581 | struct l2cap_chan *chan; |
1da177e4 LT |
2582 | |
2583 | BT_DBG("conn %p", conn); | |
2584 | ||
3df91ea2 | 2585 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2586 | |
3df91ea2 | 2587 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 2588 | struct sock *sk = chan->sk; |
715ec005 | 2589 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2590 | continue; |
2591 | ||
2592 | /* Don't send frame to the socket it came from */ | |
2593 | if (skb->sk == sk) | |
2594 | continue; | |
af05b30b GP |
2595 | nskb = skb_clone(skb, GFP_ATOMIC); |
2596 | if (!nskb) | |
1da177e4 LT |
2597 | continue; |
2598 | ||
23070494 | 2599 | if (chan->ops->recv(chan->data, nskb)) |
1da177e4 LT |
2600 | kfree_skb(nskb); |
2601 | } | |
3d57dc68 | 2602 | |
3df91ea2 | 2603 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2604 | } |
2605 | ||
2606 | /* ---- L2CAP signalling commands ---- */ | |
2607 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
2608 | u8 code, u8 ident, u16 dlen, void *data) | |
2609 | { | |
2610 | struct sk_buff *skb, **frag; | |
2611 | struct l2cap_cmd_hdr *cmd; | |
2612 | struct l2cap_hdr *lh; | |
2613 | int len, count; | |
2614 | ||
af05b30b GP |
2615 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
2616 | conn, code, ident, dlen); | |
1da177e4 LT |
2617 | |
2618 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2619 | count = min_t(unsigned int, conn->mtu, len); | |
2620 | ||
2621 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
2622 | if (!skb) | |
2623 | return NULL; | |
2624 | ||
2625 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2626 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2627 | |
2628 | if (conn->hcon->type == LE_LINK) | |
2629 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
2630 | else | |
2631 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
2632 | |
2633 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2634 | cmd->code = code; | |
2635 | cmd->ident = ident; | |
aca3192c | 2636 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2637 | |
2638 | if (dlen) { | |
2639 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2640 | memcpy(skb_put(skb, count), data, count); | |
2641 | data += count; | |
2642 | } | |
2643 | ||
2644 | len -= skb->len; | |
2645 | ||
2646 | /* Continuation fragments (no L2CAP header) */ | |
2647 | frag = &skb_shinfo(skb)->frag_list; | |
2648 | while (len) { | |
2649 | count = min_t(unsigned int, conn->mtu, len); | |
2650 | ||
2651 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
2652 | if (!*frag) | |
2653 | goto fail; | |
2654 | ||
2655 | memcpy(skb_put(*frag, count), data, count); | |
2656 | ||
2657 | len -= count; | |
2658 | data += count; | |
2659 | ||
2660 | frag = &(*frag)->next; | |
2661 | } | |
2662 | ||
2663 | return skb; | |
2664 | ||
2665 | fail: | |
2666 | kfree_skb(skb); | |
2667 | return NULL; | |
2668 | } | |
2669 | ||
2670 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
2671 | { | |
2672 | struct l2cap_conf_opt *opt = *ptr; | |
2673 | int len; | |
2674 | ||
2675 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2676 | *ptr += len; | |
2677 | ||
2678 | *type = opt->type; | |
2679 | *olen = opt->len; | |
2680 | ||
2681 | switch (opt->len) { | |
2682 | case 1: | |
2683 | *val = *((u8 *) opt->val); | |
2684 | break; | |
2685 | ||
2686 | case 2: | |
bfaaeb3e | 2687 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2688 | break; |
2689 | ||
2690 | case 4: | |
bfaaeb3e | 2691 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2692 | break; |
2693 | ||
2694 | default: | |
2695 | *val = (unsigned long) opt->val; | |
2696 | break; | |
2697 | } | |
2698 | ||
2699 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
2700 | return len; | |
2701 | } | |
2702 | ||
1da177e4 LT |
2703 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2704 | { | |
2705 | struct l2cap_conf_opt *opt = *ptr; | |
2706 | ||
2707 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
2708 | ||
2709 | opt->type = type; | |
2710 | opt->len = len; | |
2711 | ||
2712 | switch (len) { | |
2713 | case 1: | |
2714 | *((u8 *) opt->val) = val; | |
2715 | break; | |
2716 | ||
2717 | case 2: | |
4f8b691c | 2718 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2719 | break; |
2720 | ||
2721 | case 4: | |
4f8b691c | 2722 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2723 | break; |
2724 | ||
2725 | default: | |
2726 | memcpy(opt->val, (void *) val, len); | |
2727 | break; | |
2728 | } | |
2729 | ||
2730 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2731 | } | |
2732 | ||
f89cef09 AE |
2733 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
2734 | { | |
2735 | struct l2cap_conf_efs efs; | |
2736 | ||
1ec918ce | 2737 | switch (chan->mode) { |
f89cef09 AE |
2738 | case L2CAP_MODE_ERTM: |
2739 | efs.id = chan->local_id; | |
2740 | efs.stype = chan->local_stype; | |
2741 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2742 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2743 | efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); | |
2744 | efs.flush_to = cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO); | |
2745 | break; | |
2746 | ||
2747 | case L2CAP_MODE_STREAMING: | |
2748 | efs.id = 1; | |
2749 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
2750 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2751 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2752 | efs.acc_lat = 0; | |
2753 | efs.flush_to = 0; | |
2754 | break; | |
2755 | ||
2756 | default: | |
2757 | return; | |
2758 | } | |
2759 | ||
2760 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
2761 | (unsigned long) &efs); | |
2762 | } | |
2763 | ||
721c4181 | 2764 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 2765 | { |
721c4181 GP |
2766 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
2767 | ack_timer.work); | |
c1b4f43b | 2768 | |
2fb9b3d4 GP |
2769 | BT_DBG("chan %p", chan); |
2770 | ||
6be36555 AE |
2771 | l2cap_chan_lock(chan); |
2772 | ||
0a0aba42 | 2773 | l2cap_send_ack(chan); |
6be36555 AE |
2774 | |
2775 | l2cap_chan_unlock(chan); | |
09bfb2ee SJ |
2776 | |
2777 | l2cap_chan_put(chan); | |
c1b4f43b GP |
2778 | } |
2779 | ||
3c588192 | 2780 | static inline int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 2781 | { |
3c588192 MM |
2782 | int err; |
2783 | ||
105bdf9e MM |
2784 | chan->next_tx_seq = 0; |
2785 | chan->expected_tx_seq = 0; | |
42e5c802 | 2786 | chan->expected_ack_seq = 0; |
6a026610 | 2787 | chan->unacked_frames = 0; |
42e5c802 | 2788 | chan->buffer_seq = 0; |
6a026610 | 2789 | chan->frames_sent = 0; |
105bdf9e MM |
2790 | chan->last_acked_seq = 0; |
2791 | chan->sdu = NULL; | |
2792 | chan->sdu_last_frag = NULL; | |
2793 | chan->sdu_len = 0; | |
2794 | ||
d34c34fb MM |
2795 | skb_queue_head_init(&chan->tx_q); |
2796 | ||
105bdf9e MM |
2797 | if (chan->mode != L2CAP_MODE_ERTM) |
2798 | return 0; | |
2799 | ||
2800 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2801 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 2802 | |
721c4181 GP |
2803 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
2804 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
2805 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 2806 | |
f1c6775b | 2807 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 2808 | |
3c588192 MM |
2809 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
2810 | if (err < 0) | |
2811 | return err; | |
2812 | ||
9dc9affc MM |
2813 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
2814 | if (err < 0) | |
2815 | l2cap_seq_list_free(&chan->srej_list); | |
2816 | ||
2817 | return err; | |
0565c1c2 GP |
2818 | } |
2819 | ||
f2fcfcd6 GP |
2820 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2821 | { | |
2822 | switch (mode) { | |
2823 | case L2CAP_MODE_STREAMING: | |
2824 | case L2CAP_MODE_ERTM: | |
2825 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2826 | return mode; | |
2827 | /* fall through */ | |
2828 | default: | |
2829 | return L2CAP_MODE_BASIC; | |
2830 | } | |
2831 | } | |
2832 | ||
6327eb98 AE |
2833 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
2834 | { | |
2835 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
2836 | } | |
2837 | ||
f89cef09 AE |
2838 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
2839 | { | |
2840 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
2841 | } | |
2842 | ||
6327eb98 AE |
2843 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
2844 | { | |
2845 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
836be934 | 2846 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
2847 | /* use extended control field */ |
2848 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
2849 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
2850 | } else { | |
6327eb98 AE |
2851 | chan->tx_win = min_t(u16, chan->tx_win, |
2852 | L2CAP_DEFAULT_TX_WINDOW); | |
836be934 AE |
2853 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
2854 | } | |
6327eb98 AE |
2855 | } |
2856 | ||
710f9b0a | 2857 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2858 | { |
1da177e4 | 2859 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 2860 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 2861 | void *ptr = req->data; |
c8f79162 | 2862 | u16 size; |
1da177e4 | 2863 | |
49208c9c | 2864 | BT_DBG("chan %p", chan); |
1da177e4 | 2865 | |
73ffa904 | 2866 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
2867 | goto done; |
2868 | ||
0c1bc5c6 | 2869 | switch (chan->mode) { |
f2fcfcd6 GP |
2870 | case L2CAP_MODE_STREAMING: |
2871 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2872 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 2873 | break; |
85eb53c6 | 2874 | |
f89cef09 AE |
2875 | if (__l2cap_efs_supported(chan)) |
2876 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2877 | ||
2ba13ed6 | 2878 | /* fall through */ |
f2fcfcd6 | 2879 | default: |
8c1d787b | 2880 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
2881 | break; |
2882 | } | |
2883 | ||
2884 | done: | |
0c1bc5c6 GP |
2885 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
2886 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 2887 | |
0c1bc5c6 | 2888 | switch (chan->mode) { |
65c7c491 | 2889 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
2890 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2891 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
2892 | break; |
2893 | ||
62547752 GP |
2894 | rfc.mode = L2CAP_MODE_BASIC; |
2895 | rfc.txwin_size = 0; | |
2896 | rfc.max_transmit = 0; | |
2897 | rfc.retrans_timeout = 0; | |
2898 | rfc.monitor_timeout = 0; | |
2899 | rfc.max_pdu_size = 0; | |
2900 | ||
63406504 GP |
2901 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2902 | (unsigned long) &rfc); | |
65c7c491 MH |
2903 | break; |
2904 | ||
2905 | case L2CAP_MODE_ERTM: | |
2906 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 2907 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
2908 | rfc.retrans_timeout = 0; |
2909 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2910 | |
2911 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2912 | L2CAP_EXT_HDR_SIZE - | |
2913 | L2CAP_SDULEN_SIZE - | |
2914 | L2CAP_FCS_SIZE); | |
2915 | rfc.max_pdu_size = cpu_to_le16(size); | |
f2fcfcd6 | 2916 | |
6327eb98 AE |
2917 | l2cap_txwin_setup(chan); |
2918 | ||
2919 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2920 | L2CAP_DEFAULT_TX_WINDOW); | |
f2fcfcd6 | 2921 | |
63406504 GP |
2922 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2923 | (unsigned long) &rfc); | |
2924 | ||
f89cef09 AE |
2925 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2926 | l2cap_add_opt_efs(&ptr, chan); | |
2927 | ||
8c1d787b | 2928 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2929 | break; |
2930 | ||
47d1ec61 | 2931 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2932 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2933 | chan->fcs = L2CAP_FCS_NONE; |
2934 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2935 | } |
6327eb98 AE |
2936 | |
2937 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2938 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2939 | chan->tx_win); | |
f2fcfcd6 GP |
2940 | break; |
2941 | ||
2942 | case L2CAP_MODE_STREAMING: | |
2943 | rfc.mode = L2CAP_MODE_STREAMING; | |
2944 | rfc.txwin_size = 0; | |
2945 | rfc.max_transmit = 0; | |
2946 | rfc.retrans_timeout = 0; | |
2947 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2948 | |
2949 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2950 | L2CAP_EXT_HDR_SIZE - | |
2951 | L2CAP_SDULEN_SIZE - | |
2952 | L2CAP_FCS_SIZE); | |
2953 | rfc.max_pdu_size = cpu_to_le16(size); | |
65c7c491 | 2954 | |
63406504 GP |
2955 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2956 | (unsigned long) &rfc); | |
2957 | ||
f89cef09 AE |
2958 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2959 | l2cap_add_opt_efs(&ptr, chan); | |
2960 | ||
8c1d787b | 2961 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2962 | break; |
2963 | ||
47d1ec61 | 2964 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2965 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2966 | chan->fcs = L2CAP_FCS_NONE; |
2967 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2968 | } |
65c7c491 MH |
2969 | break; |
2970 | } | |
1da177e4 | 2971 | |
fe4128e0 | 2972 | req->dcid = cpu_to_le16(chan->dcid); |
aca3192c | 2973 | req->flags = cpu_to_le16(0); |
1da177e4 LT |
2974 | |
2975 | return ptr - data; | |
2976 | } | |
2977 | ||
73ffa904 | 2978 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2979 | { |
5dee9e7c MH |
2980 | struct l2cap_conf_rsp *rsp = data; |
2981 | void *ptr = rsp->data; | |
73ffa904 GP |
2982 | void *req = chan->conf_req; |
2983 | int len = chan->conf_len; | |
5dee9e7c MH |
2984 | int type, hint, olen; |
2985 | unsigned long val; | |
6464f35f | 2986 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
2987 | struct l2cap_conf_efs efs; |
2988 | u8 remote_efs = 0; | |
861d6882 | 2989 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2990 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 2991 | u16 size; |
1da177e4 | 2992 | |
73ffa904 | 2993 | BT_DBG("chan %p", chan); |
820ae1b8 | 2994 | |
5dee9e7c MH |
2995 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2996 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2997 | |
589d2746 | 2998 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2999 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
3000 | |
3001 | switch (type) { | |
3002 | case L2CAP_CONF_MTU: | |
861d6882 | 3003 | mtu = val; |
5dee9e7c MH |
3004 | break; |
3005 | ||
3006 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3007 | chan->flush_to = val; |
5dee9e7c MH |
3008 | break; |
3009 | ||
3010 | case L2CAP_CONF_QOS: | |
3011 | break; | |
3012 | ||
6464f35f MH |
3013 | case L2CAP_CONF_RFC: |
3014 | if (olen == sizeof(rfc)) | |
3015 | memcpy(&rfc, (void *) val, olen); | |
3016 | break; | |
3017 | ||
fcc203c3 GP |
3018 | case L2CAP_CONF_FCS: |
3019 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 3020 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
42dceae2 | 3021 | break; |
fcc203c3 | 3022 | |
42dceae2 AE |
3023 | case L2CAP_CONF_EFS: |
3024 | remote_efs = 1; | |
3025 | if (olen == sizeof(efs)) | |
3026 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
3027 | break; |
3028 | ||
6327eb98 AE |
3029 | case L2CAP_CONF_EWS: |
3030 | if (!enable_hs) | |
3031 | return -ECONNREFUSED; | |
fcc203c3 | 3032 | |
6327eb98 AE |
3033 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
3034 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 3035 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 3036 | chan->remote_tx_win = val; |
fcc203c3 GP |
3037 | break; |
3038 | ||
5dee9e7c MH |
3039 | default: |
3040 | if (hint) | |
3041 | break; | |
3042 | ||
3043 | result = L2CAP_CONF_UNKNOWN; | |
3044 | *((u8 *) ptr++) = type; | |
3045 | break; | |
3046 | } | |
3047 | } | |
3048 | ||
73ffa904 | 3049 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
3050 | goto done; |
3051 | ||
0c1bc5c6 | 3052 | switch (chan->mode) { |
f2fcfcd6 GP |
3053 | case L2CAP_MODE_STREAMING: |
3054 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3055 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 3056 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 3057 | chan->conn->feat_mask); |
85eb53c6 GP |
3058 | break; |
3059 | } | |
3060 | ||
42dceae2 AE |
3061 | if (remote_efs) { |
3062 | if (__l2cap_efs_supported(chan)) | |
3063 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
3064 | else | |
3065 | return -ECONNREFUSED; | |
3066 | } | |
3067 | ||
0c1bc5c6 | 3068 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 3069 | return -ECONNREFUSED; |
742e519b | 3070 | |
f2fcfcd6 | 3071 | break; |
f2fcfcd6 GP |
3072 | } |
3073 | ||
3074 | done: | |
0c1bc5c6 | 3075 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 3076 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 3077 | rfc.mode = chan->mode; |
f2fcfcd6 | 3078 | |
73ffa904 | 3079 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
3080 | return -ECONNREFUSED; |
3081 | ||
3082 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3083 | sizeof(rfc), (unsigned long) &rfc); | |
3084 | } | |
3085 | ||
5dee9e7c MH |
3086 | if (result == L2CAP_CONF_SUCCESS) { |
3087 | /* Configure output options and let the other side know | |
3088 | * which ones we don't like. */ | |
3089 | ||
f2fcfcd6 GP |
3090 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3091 | result = L2CAP_CONF_UNACCEPT; | |
3092 | else { | |
0c1bc5c6 | 3093 | chan->omtu = mtu; |
c1360a1c | 3094 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 3095 | } |
0c1bc5c6 | 3096 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 3097 | |
42dceae2 AE |
3098 | if (remote_efs) { |
3099 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
3100 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
3101 | efs.stype != chan->local_stype) { | |
3102 | ||
3103 | result = L2CAP_CONF_UNACCEPT; | |
3104 | ||
3105 | if (chan->num_conf_req >= 1) | |
3106 | return -ECONNREFUSED; | |
3107 | ||
3108 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3e6b3b95 | 3109 | sizeof(efs), |
42dceae2 | 3110 | (unsigned long) &efs); |
0e8b207e | 3111 | } else { |
3e6b3b95 | 3112 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
3113 | result = L2CAP_CONF_PENDING; |
3114 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
3115 | } |
3116 | } | |
3117 | ||
f2fcfcd6 GP |
3118 | switch (rfc.mode) { |
3119 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 3120 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3121 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
3122 | break; |
3123 | ||
3124 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
3125 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3126 | chan->remote_tx_win = rfc.txwin_size; | |
3127 | else | |
3128 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 3129 | |
2c03a7a4 | 3130 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 3131 | |
c8f79162 AE |
3132 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
3133 | chan->conn->mtu - | |
3134 | L2CAP_EXT_HDR_SIZE - | |
3135 | L2CAP_SDULEN_SIZE - | |
3136 | L2CAP_FCS_SIZE); | |
3137 | rfc.max_pdu_size = cpu_to_le16(size); | |
3138 | chan->remote_mps = size; | |
f2fcfcd6 | 3139 | |
10467e9e | 3140 | rfc.retrans_timeout = |
4fd21a88 | 3141 | __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
10467e9e | 3142 | rfc.monitor_timeout = |
4fd21a88 | 3143 | __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); |
f2fcfcd6 | 3144 | |
c1360a1c | 3145 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3146 | |
3147 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3148 | sizeof(rfc), (unsigned long) &rfc); | |
3149 | ||
42dceae2 AE |
3150 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3151 | chan->remote_id = efs.id; | |
3152 | chan->remote_stype = efs.stype; | |
3153 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3154 | chan->remote_flush_to = | |
3155 | le32_to_cpu(efs.flush_to); | |
3156 | chan->remote_acc_lat = | |
3157 | le32_to_cpu(efs.acc_lat); | |
3158 | chan->remote_sdu_itime = | |
3159 | le32_to_cpu(efs.sdu_itime); | |
3160 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3161 | sizeof(efs), (unsigned long) &efs); | |
3162 | } | |
f2fcfcd6 GP |
3163 | break; |
3164 | ||
3165 | case L2CAP_MODE_STREAMING: | |
c8f79162 AE |
3166 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
3167 | chan->conn->mtu - | |
3168 | L2CAP_EXT_HDR_SIZE - | |
3169 | L2CAP_SDULEN_SIZE - | |
3170 | L2CAP_FCS_SIZE); | |
3171 | rfc.max_pdu_size = cpu_to_le16(size); | |
3172 | chan->remote_mps = size; | |
f2fcfcd6 | 3173 | |
c1360a1c | 3174 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3175 | |
3176 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3177 | sizeof(rfc), (unsigned long) &rfc); | |
3178 | ||
f2fcfcd6 GP |
3179 | break; |
3180 | ||
3181 | default: | |
5dee9e7c | 3182 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3183 | |
6464f35f | 3184 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3185 | rfc.mode = chan->mode; |
f2fcfcd6 | 3186 | } |
6464f35f | 3187 | |
f2fcfcd6 | 3188 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3189 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3190 | } |
fe4128e0 | 3191 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c MH |
3192 | rsp->result = cpu_to_le16(result); |
3193 | rsp->flags = cpu_to_le16(0x0000); | |
3194 | ||
3195 | return ptr - data; | |
1da177e4 LT |
3196 | } |
3197 | ||
b4450035 | 3198 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 3199 | { |
f2fcfcd6 GP |
3200 | struct l2cap_conf_req *req = data; |
3201 | void *ptr = req->data; | |
3202 | int type, olen; | |
3203 | unsigned long val; | |
36e999a8 | 3204 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3205 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3206 | |
fe4128e0 | 3207 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3208 | |
3209 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3210 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3211 | ||
3212 | switch (type) { | |
3213 | case L2CAP_CONF_MTU: | |
3214 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3215 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3216 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3217 | } else |
0c1bc5c6 GP |
3218 | chan->imtu = val; |
3219 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3220 | break; |
3221 | ||
3222 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3223 | chan->flush_to = val; |
f2fcfcd6 | 3224 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 3225 | 2, chan->flush_to); |
f2fcfcd6 GP |
3226 | break; |
3227 | ||
3228 | case L2CAP_CONF_RFC: | |
3229 | if (olen == sizeof(rfc)) | |
3230 | memcpy(&rfc, (void *)val, olen); | |
3231 | ||
c1360a1c | 3232 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
0c1bc5c6 | 3233 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3234 | return -ECONNREFUSED; |
3235 | ||
47d1ec61 | 3236 | chan->fcs = 0; |
f2fcfcd6 GP |
3237 | |
3238 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3239 | sizeof(rfc), (unsigned long) &rfc); | |
3240 | break; | |
6327eb98 AE |
3241 | |
3242 | case L2CAP_CONF_EWS: | |
3243 | chan->tx_win = min_t(u16, val, | |
3244 | L2CAP_DEFAULT_EXT_WINDOW); | |
3e6b3b95 GP |
3245 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
3246 | chan->tx_win); | |
6327eb98 | 3247 | break; |
66af7aaf AE |
3248 | |
3249 | case L2CAP_CONF_EFS: | |
3250 | if (olen == sizeof(efs)) | |
3251 | memcpy(&efs, (void *)val, olen); | |
3252 | ||
3253 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
3254 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
3255 | efs.stype != chan->local_stype) | |
3256 | return -ECONNREFUSED; | |
3257 | ||
3258 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3259 | sizeof(efs), (unsigned long) &efs); | |
3260 | break; | |
f2fcfcd6 GP |
3261 | } |
3262 | } | |
3263 | ||
0c1bc5c6 | 3264 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3265 | return -ECONNREFUSED; |
3266 | ||
0c1bc5c6 | 3267 | chan->mode = rfc.mode; |
6c2ea7a8 | 3268 | |
0e8b207e | 3269 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3270 | switch (rfc.mode) { |
3271 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3272 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3273 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3274 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
66af7aaf AE |
3275 | |
3276 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3277 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3278 | chan->local_sdu_itime = | |
3279 | le32_to_cpu(efs.sdu_itime); | |
3280 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); | |
3281 | chan->local_flush_to = | |
3282 | le32_to_cpu(efs.flush_to); | |
3283 | } | |
f2fcfcd6 | 3284 | break; |
66af7aaf | 3285 | |
f2fcfcd6 | 3286 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3287 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3288 | } |
3289 | } | |
3290 | ||
fe4128e0 | 3291 | req->dcid = cpu_to_le16(chan->dcid); |
f2fcfcd6 GP |
3292 | req->flags = cpu_to_le16(0x0000); |
3293 | ||
3294 | return ptr - data; | |
3295 | } | |
3296 | ||
fe4128e0 | 3297 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
3298 | { |
3299 | struct l2cap_conf_rsp *rsp = data; | |
3300 | void *ptr = rsp->data; | |
1da177e4 | 3301 | |
fe4128e0 | 3302 | BT_DBG("chan %p", chan); |
1da177e4 | 3303 | |
fe4128e0 | 3304 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3305 | rsp->result = cpu_to_le16(result); |
aca3192c | 3306 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3307 | |
3308 | return ptr - data; | |
3309 | } | |
3310 | ||
8c1d787b | 3311 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3312 | { |
3313 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3314 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
3315 | u8 buf[128]; |
3316 | ||
fe4128e0 GP |
3317 | rsp.scid = cpu_to_le16(chan->dcid); |
3318 | rsp.dcid = cpu_to_le16(chan->scid); | |
710f9b0a GP |
3319 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
3320 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
3321 | l2cap_send_cmd(conn, chan->ident, | |
3322 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
3323 | ||
c1360a1c | 3324 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3325 | return; |
3326 | ||
710f9b0a GP |
3327 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
3328 | l2cap_build_conf_req(chan, buf), buf); | |
3329 | chan->num_conf_req++; | |
3330 | } | |
3331 | ||
47d1ec61 | 3332 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3333 | { |
7b1c0049 GP |
3334 | int type, olen; |
3335 | unsigned long val; | |
3336 | struct l2cap_conf_rfc rfc; | |
3337 | ||
47d1ec61 | 3338 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3339 | |
0c1bc5c6 | 3340 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3341 | return; |
3342 | ||
3343 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3344 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3345 | ||
3346 | switch (type) { | |
3347 | case L2CAP_CONF_RFC: | |
3348 | if (olen == sizeof(rfc)) | |
3349 | memcpy(&rfc, (void *)val, olen); | |
3350 | goto done; | |
3351 | } | |
3352 | } | |
3353 | ||
36e999a8 MM |
3354 | /* Use sane default values in case a misbehaving remote device |
3355 | * did not send an RFC option. | |
3356 | */ | |
3357 | rfc.mode = chan->mode; | |
3358 | rfc.retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); | |
3359 | rfc.monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
3360 | rfc.max_pdu_size = cpu_to_le16(chan->imtu); | |
3361 | ||
3362 | BT_ERR("Expected RFC option was not found, using defaults"); | |
3363 | ||
7b1c0049 GP |
3364 | done: |
3365 | switch (rfc.mode) { | |
3366 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3367 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3368 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3369 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
7b1c0049 GP |
3370 | break; |
3371 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3372 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3373 | } |
3374 | } | |
3375 | ||
4e8402a3 MH |
3376 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
3377 | { | |
e2fd318e | 3378 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3379 | |
e2fd318e | 3380 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3381 | return 0; |
3382 | ||
3383 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
3384 | cmd->ident == conn->info_ident) { | |
17cd3f37 | 3385 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3386 | |
3387 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3388 | conn->info_ident = 0; |
984947dc | 3389 | |
4e8402a3 MH |
3390 | l2cap_conn_start(conn); |
3391 | } | |
3392 | ||
3393 | return 0; | |
3394 | } | |
3395 | ||
1da177e4 LT |
3396 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
3397 | { | |
1da177e4 LT |
3398 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3399 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3400 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 3401 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 3402 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3403 | |
3404 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3405 | __le16 psm = req->psm; |
1da177e4 | 3406 | |
097db76c | 3407 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3408 | |
3409 | /* Check if we have socket listening on psm */ | |
c2287681 | 3410 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); |
23691d75 | 3411 | if (!pchan) { |
1da177e4 LT |
3412 | result = L2CAP_CR_BAD_PSM; |
3413 | goto sendresp; | |
3414 | } | |
3415 | ||
23691d75 GP |
3416 | parent = pchan->sk; |
3417 | ||
3df91ea2 | 3418 | mutex_lock(&conn->chan_lock); |
aa2ac881 | 3419 | lock_sock(parent); |
e0f0cb56 | 3420 | |
e7c29cb1 MH |
3421 | /* Check if the ACL is secure enough (if not SDP) */ |
3422 | if (psm != cpu_to_le16(0x0001) && | |
3423 | !hci_conn_check_link_mode(conn->hcon)) { | |
9f5a0d7b | 3424 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3425 | result = L2CAP_CR_SEC_BLOCK; |
3426 | goto response; | |
3427 | } | |
3428 | ||
1da177e4 LT |
3429 | result = L2CAP_CR_NO_MEM; |
3430 | ||
3431 | /* Check for backlog size */ | |
3432 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 3433 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
3434 | goto response; |
3435 | } | |
3436 | ||
80808e43 GP |
3437 | chan = pchan->ops->new_connection(pchan->data); |
3438 | if (!chan) | |
1da177e4 LT |
3439 | goto response; |
3440 | ||
80808e43 GP |
3441 | sk = chan->sk; |
3442 | ||
1da177e4 | 3443 | /* Check if we already have channel with that dcid */ |
baa7e1fa | 3444 | if (__l2cap_get_chan_by_dcid(conn, scid)) { |
1da177e4 | 3445 | sock_set_flag(sk, SOCK_ZAPPED); |
ba3bd0ee | 3446 | chan->ops->close(chan->data); |
1da177e4 LT |
3447 | goto response; |
3448 | } | |
3449 | ||
3450 | hci_conn_hold(conn->hcon); | |
3451 | ||
1da177e4 LT |
3452 | bacpy(&bt_sk(sk)->src, conn->src); |
3453 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
3454 | chan->psm = psm; |
3455 | chan->dcid = scid; | |
1da177e4 | 3456 | |
d1010240 GP |
3457 | bt_accept_enqueue(parent, sk); |
3458 | ||
6be36555 | 3459 | __l2cap_chan_add(conn, chan); |
48454079 | 3460 | |
fe4128e0 | 3461 | dcid = chan->scid; |
1da177e4 | 3462 | |
c9b66675 | 3463 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 3464 | |
fc7f8a7e | 3465 | chan->ident = cmd->ident; |
1da177e4 | 3466 | |
984947dc | 3467 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 3468 | if (l2cap_chan_check_security(chan)) { |
c5daa683 | 3469 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { |
0e587be7 | 3470 | __l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3471 | result = L2CAP_CR_PEND; |
3472 | status = L2CAP_CS_AUTHOR_PEND; | |
3473 | parent->sk_data_ready(parent, 0); | |
3474 | } else { | |
0e587be7 | 3475 | __l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
3476 | result = L2CAP_CR_SUCCESS; |
3477 | status = L2CAP_CS_NO_INFO; | |
3478 | } | |
79d554a6 | 3479 | } else { |
0e587be7 | 3480 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3481 | result = L2CAP_CR_PEND; |
3482 | status = L2CAP_CS_AUTHEN_PEND; | |
3483 | } | |
3484 | } else { | |
0e587be7 | 3485 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3486 | result = L2CAP_CR_PEND; |
3487 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3488 | } |
3489 | ||
1da177e4 | 3490 | response: |
aa2ac881 | 3491 | release_sock(parent); |
3df91ea2 | 3492 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
3493 | |
3494 | sendresp: | |
aca3192c YH |
3495 | rsp.scid = cpu_to_le16(scid); |
3496 | rsp.dcid = cpu_to_le16(dcid); | |
3497 | rsp.result = cpu_to_le16(result); | |
3498 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 3499 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
3500 | |
3501 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3502 | struct l2cap_info_req info; | |
3503 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3504 | ||
3505 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3506 | conn->info_ident = l2cap_get_ident(conn); | |
3507 | ||
ba13ccd9 | 3508 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
3509 | |
3510 | l2cap_send_cmd(conn, conn->info_ident, | |
3511 | L2CAP_INFO_REQ, sizeof(info), &info); | |
3512 | } | |
3513 | ||
c1360a1c | 3514 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
e9aeb2dd GP |
3515 | result == L2CAP_CR_SUCCESS) { |
3516 | u8 buf[128]; | |
c1360a1c | 3517 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3518 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3519 | l2cap_build_conf_req(chan, buf), buf); |
3520 | chan->num_conf_req++; | |
e9aeb2dd GP |
3521 | } |
3522 | ||
1da177e4 LT |
3523 | return 0; |
3524 | } | |
3525 | ||
3526 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3527 | { | |
3528 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3529 | u16 scid, dcid, result, status; | |
48454079 | 3530 | struct l2cap_chan *chan; |
1da177e4 | 3531 | u8 req[128]; |
3df91ea2 | 3532 | int err; |
1da177e4 LT |
3533 | |
3534 | scid = __le16_to_cpu(rsp->scid); | |
3535 | dcid = __le16_to_cpu(rsp->dcid); | |
3536 | result = __le16_to_cpu(rsp->result); | |
3537 | status = __le16_to_cpu(rsp->status); | |
3538 | ||
1b009c98 AE |
3539 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
3540 | dcid, scid, result, status); | |
1da177e4 | 3541 | |
3df91ea2 AE |
3542 | mutex_lock(&conn->chan_lock); |
3543 | ||
1da177e4 | 3544 | if (scid) { |
3df91ea2 AE |
3545 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3546 | if (!chan) { | |
3547 | err = -EFAULT; | |
3548 | goto unlock; | |
3549 | } | |
1da177e4 | 3550 | } else { |
3df91ea2 AE |
3551 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3552 | if (!chan) { | |
3553 | err = -EFAULT; | |
3554 | goto unlock; | |
3555 | } | |
1da177e4 LT |
3556 | } |
3557 | ||
3df91ea2 AE |
3558 | err = 0; |
3559 | ||
6be36555 | 3560 | l2cap_chan_lock(chan); |
48454079 | 3561 | |
1da177e4 LT |
3562 | switch (result) { |
3563 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3564 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3565 | chan->ident = 0; |
fe4128e0 | 3566 | chan->dcid = dcid; |
c1360a1c | 3567 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3568 | |
c1360a1c | 3569 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3570 | break; |
3571 | ||
1da177e4 | 3572 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3573 | l2cap_build_conf_req(chan, req), req); |
3574 | chan->num_conf_req++; | |
1da177e4 LT |
3575 | break; |
3576 | ||
3577 | case L2CAP_CR_PEND: | |
c1360a1c | 3578 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3579 | break; |
3580 | ||
3581 | default: | |
48454079 | 3582 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3583 | break; |
3584 | } | |
3585 | ||
6be36555 | 3586 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3587 | |
3588 | unlock: | |
3589 | mutex_unlock(&conn->chan_lock); | |
3590 | ||
3591 | return err; | |
1da177e4 LT |
3592 | } |
3593 | ||
47d1ec61 | 3594 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3595 | { |
3596 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3597 | * sides request it. | |
3598 | */ | |
0c1bc5c6 | 3599 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3600 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3601 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 3602 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3603 | } |
3604 | ||
88219a0f | 3605 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
3606 | { |
3607 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3608 | u16 dcid, flags; | |
3609 | u8 rsp[64]; | |
48454079 | 3610 | struct l2cap_chan *chan; |
3c588192 | 3611 | int len, err = 0; |
1da177e4 LT |
3612 | |
3613 | dcid = __le16_to_cpu(req->dcid); | |
3614 | flags = __le16_to_cpu(req->flags); | |
3615 | ||
3616 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
3617 | ||
baa7e1fa | 3618 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 3619 | if (!chan) |
1da177e4 LT |
3620 | return -ENOENT; |
3621 | ||
033b1142 | 3622 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
3623 | struct l2cap_cmd_rej_cid rej; |
3624 | ||
3625 | rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); | |
3626 | rej.scid = cpu_to_le16(chan->scid); | |
3627 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 3628 | |
df6bd743 GP |
3629 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
3630 | sizeof(rej), &rej); | |
354f60a9 | 3631 | goto unlock; |
df6bd743 | 3632 | } |
354f60a9 | 3633 | |
5dee9e7c | 3634 | /* Reject if config buffer is too small. */ |
88219a0f | 3635 | len = cmd_len - sizeof(*req); |
7ac28817 | 3636 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 3637 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 3638 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
3639 | L2CAP_CONF_REJECT, flags), rsp); |
3640 | goto unlock; | |
3641 | } | |
3642 | ||
3643 | /* Store config. */ | |
73ffa904 GP |
3644 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
3645 | chan->conf_len += len; | |
1da177e4 LT |
3646 | |
3647 | if (flags & 0x0001) { | |
3648 | /* Incomplete config. Send empty response. */ | |
3649 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 3650 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c | 3651 | L2CAP_CONF_SUCCESS, 0x0001), rsp); |
1da177e4 LT |
3652 | goto unlock; |
3653 | } | |
3654 | ||
3655 | /* Complete config. */ | |
73ffa904 | 3656 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 3657 | if (len < 0) { |
e92c8e70 | 3658 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 3659 | goto unlock; |
f2fcfcd6 | 3660 | } |
1da177e4 | 3661 | |
5dee9e7c | 3662 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 3663 | chan->num_conf_rsp++; |
5dee9e7c | 3664 | |
5dee9e7c | 3665 | /* Reset config buffer. */ |
73ffa904 | 3666 | chan->conf_len = 0; |
5dee9e7c | 3667 | |
c1360a1c | 3668 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
3669 | goto unlock; |
3670 | ||
c1360a1c | 3671 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3672 | set_default_fcs(chan); |
fcc203c3 | 3673 | |
89bc500e | 3674 | l2cap_state_change(chan, BT_CONNECTED); |
e90bac06 | 3675 | |
105bdf9e MM |
3676 | if (chan->mode == L2CAP_MODE_ERTM || |
3677 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
3678 | err = l2cap_ertm_init(chan); |
3679 | ||
3680 | if (err < 0) | |
3681 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3682 | else | |
3683 | l2cap_chan_ready(chan); | |
0565c1c2 | 3684 | |
876d9484 MH |
3685 | goto unlock; |
3686 | } | |
3687 | ||
c1360a1c | 3688 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 3689 | u8 buf[64]; |
1da177e4 | 3690 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3691 | l2cap_build_conf_req(chan, buf), buf); |
3692 | chan->num_conf_req++; | |
1da177e4 LT |
3693 | } |
3694 | ||
0e8b207e AE |
3695 | /* Got Conf Rsp PENDING from remote side and asume we sent |
3696 | Conf Rsp PENDING in the code above */ | |
3697 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
3698 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3699 | ||
3700 | /* check compatibility */ | |
3701 | ||
3702 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3703 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3704 | ||
3705 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 3706 | l2cap_build_conf_rsp(chan, rsp, |
0e8b207e AE |
3707 | L2CAP_CONF_SUCCESS, 0x0000), rsp); |
3708 | } | |
3709 | ||
1da177e4 | 3710 | unlock: |
6be36555 | 3711 | l2cap_chan_unlock(chan); |
3c588192 | 3712 | return err; |
1da177e4 LT |
3713 | } |
3714 | ||
3715 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3716 | { | |
3717 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
3718 | u16 scid, flags, result; | |
48454079 | 3719 | struct l2cap_chan *chan; |
61386cba | 3720 | int len = le16_to_cpu(cmd->len) - sizeof(*rsp); |
3c588192 | 3721 | int err = 0; |
1da177e4 LT |
3722 | |
3723 | scid = __le16_to_cpu(rsp->scid); | |
3724 | flags = __le16_to_cpu(rsp->flags); | |
3725 | result = __le16_to_cpu(rsp->result); | |
3726 | ||
61386cba AE |
3727 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
3728 | result, len); | |
1da177e4 | 3729 | |
baa7e1fa | 3730 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 3731 | if (!chan) |
1da177e4 LT |
3732 | return 0; |
3733 | ||
3734 | switch (result) { | |
3735 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 3736 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 3737 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
3738 | break; |
3739 | ||
0e8b207e AE |
3740 | case L2CAP_CONF_PENDING: |
3741 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
3742 | ||
3743 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3744 | char buf[64]; | |
3745 | ||
3746 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
3747 | buf, &result); | |
3748 | if (len < 0) { | |
3749 | l2cap_send_disconn_req(conn, chan, ECONNRESET); | |
3750 | goto done; | |
3751 | } | |
3752 | ||
3753 | /* check compatibility */ | |
3754 | ||
3755 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3756 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3757 | ||
3758 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 3759 | l2cap_build_conf_rsp(chan, buf, |
0e8b207e AE |
3760 | L2CAP_CONF_SUCCESS, 0x0000), buf); |
3761 | } | |
3762 | goto done; | |
3763 | ||
1da177e4 | 3764 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 3765 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
3766 | char req[64]; |
3767 | ||
c2c77ec8 | 3768 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 3769 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
3770 | goto done; |
3771 | } | |
3772 | ||
f2fcfcd6 GP |
3773 | /* throw out any old stored conf requests */ |
3774 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
3775 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
3776 | req, &result); | |
f2fcfcd6 | 3777 | if (len < 0) { |
e92c8e70 | 3778 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
3779 | goto done; |
3780 | } | |
3781 | ||
3782 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
3783 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 3784 | chan->num_conf_req++; |
f2fcfcd6 GP |
3785 | if (result != L2CAP_CONF_SUCCESS) |
3786 | goto done; | |
3787 | break; | |
1da177e4 LT |
3788 | } |
3789 | ||
8e87d142 | 3790 | default: |
6be36555 | 3791 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 3792 | |
ba13ccd9 | 3793 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
e92c8e70 | 3794 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
3795 | goto done; |
3796 | } | |
3797 | ||
3798 | if (flags & 0x01) | |
3799 | goto done; | |
3800 | ||
c1360a1c | 3801 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 3802 | |
c1360a1c | 3803 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3804 | set_default_fcs(chan); |
fcc203c3 | 3805 | |
89bc500e | 3806 | l2cap_state_change(chan, BT_CONNECTED); |
105bdf9e MM |
3807 | if (chan->mode == L2CAP_MODE_ERTM || |
3808 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 3809 | err = l2cap_ertm_init(chan); |
0565c1c2 | 3810 | |
3c588192 MM |
3811 | if (err < 0) |
3812 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3813 | else | |
3814 | l2cap_chan_ready(chan); | |
1da177e4 LT |
3815 | } |
3816 | ||
3817 | done: | |
6be36555 | 3818 | l2cap_chan_unlock(chan); |
3c588192 | 3819 | return err; |
1da177e4 LT |
3820 | } |
3821 | ||
3822 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3823 | { | |
3824 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3825 | struct l2cap_disconn_rsp rsp; | |
3826 | u16 dcid, scid; | |
48454079 | 3827 | struct l2cap_chan *chan; |
1da177e4 LT |
3828 | struct sock *sk; |
3829 | ||
3830 | scid = __le16_to_cpu(req->scid); | |
3831 | dcid = __le16_to_cpu(req->dcid); | |
3832 | ||
3833 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3834 | ||
3df91ea2 AE |
3835 | mutex_lock(&conn->chan_lock); |
3836 | ||
3837 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
3838 | if (!chan) { | |
3839 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3840 | return 0; |
3df91ea2 | 3841 | } |
1da177e4 | 3842 | |
6be36555 AE |
3843 | l2cap_chan_lock(chan); |
3844 | ||
48454079 GP |
3845 | sk = chan->sk; |
3846 | ||
fe4128e0 GP |
3847 | rsp.dcid = cpu_to_le16(chan->scid); |
3848 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
3849 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3850 | ||
6be36555 | 3851 | lock_sock(sk); |
1da177e4 | 3852 | sk->sk_shutdown = SHUTDOWN_MASK; |
6be36555 | 3853 | release_sock(sk); |
1da177e4 | 3854 | |
61d6ef3e | 3855 | l2cap_chan_hold(chan); |
48454079 | 3856 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
3857 | |
3858 | l2cap_chan_unlock(chan); | |
1da177e4 | 3859 | |
ba3bd0ee | 3860 | chan->ops->close(chan->data); |
61d6ef3e | 3861 | l2cap_chan_put(chan); |
3df91ea2 AE |
3862 | |
3863 | mutex_unlock(&conn->chan_lock); | |
3864 | ||
1da177e4 LT |
3865 | return 0; |
3866 | } | |
3867 | ||
3868 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3869 | { | |
3870 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3871 | u16 dcid, scid; | |
48454079 | 3872 | struct l2cap_chan *chan; |
1da177e4 LT |
3873 | |
3874 | scid = __le16_to_cpu(rsp->scid); | |
3875 | dcid = __le16_to_cpu(rsp->dcid); | |
3876 | ||
3877 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3878 | ||
3df91ea2 AE |
3879 | mutex_lock(&conn->chan_lock); |
3880 | ||
3881 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
3882 | if (!chan) { | |
3883 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3884 | return 0; |
3df91ea2 | 3885 | } |
1da177e4 | 3886 | |
6be36555 | 3887 | l2cap_chan_lock(chan); |
48454079 | 3888 | |
61d6ef3e | 3889 | l2cap_chan_hold(chan); |
48454079 | 3890 | l2cap_chan_del(chan, 0); |
6be36555 AE |
3891 | |
3892 | l2cap_chan_unlock(chan); | |
1da177e4 | 3893 | |
ba3bd0ee | 3894 | chan->ops->close(chan->data); |
61d6ef3e | 3895 | l2cap_chan_put(chan); |
3df91ea2 AE |
3896 | |
3897 | mutex_unlock(&conn->chan_lock); | |
3898 | ||
1da177e4 LT |
3899 | return 0; |
3900 | } | |
3901 | ||
3902 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3903 | { | |
3904 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3905 | u16 type; |
3906 | ||
3907 | type = __le16_to_cpu(req->type); | |
3908 | ||
3909 | BT_DBG("type 0x%4.4x", type); | |
3910 | ||
f0709e03 MH |
3911 | if (type == L2CAP_IT_FEAT_MASK) { |
3912 | u8 buf[8]; | |
44dd46de | 3913 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
3914 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
3915 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3916 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3917 | if (!disable_ertm) |
fcc203c3 GP |
3918 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3919 | | L2CAP_FEAT_FCS; | |
a5fd6f30 | 3920 | if (enable_hs) |
6327eb98 AE |
3921 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
3922 | | L2CAP_FEAT_EXT_WINDOW; | |
a5fd6f30 | 3923 | |
1b7bf4ed | 3924 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3925 | l2cap_send_cmd(conn, cmd->ident, |
3926 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3927 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3928 | u8 buf[12]; | |
3929 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
3930 | |
3931 | if (enable_hs) | |
3932 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
3933 | else | |
3934 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
3935 | ||
e1027a7c MH |
3936 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
3937 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 3938 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
e1027a7c MH |
3939 | l2cap_send_cmd(conn, cmd->ident, |
3940 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3941 | } else { |
3942 | struct l2cap_info_rsp rsp; | |
3943 | rsp.type = cpu_to_le16(type); | |
3944 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
3945 | l2cap_send_cmd(conn, cmd->ident, | |
3946 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3947 | } | |
1da177e4 LT |
3948 | |
3949 | return 0; | |
3950 | } | |
3951 | ||
3952 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3953 | { | |
3954 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3955 | u16 type, result; | |
3956 | ||
3957 | type = __le16_to_cpu(rsp->type); | |
3958 | result = __le16_to_cpu(rsp->result); | |
3959 | ||
3960 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3961 | ||
e90165be AE |
3962 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
3963 | if (cmd->ident != conn->info_ident || | |
3964 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
3965 | return 0; | |
3966 | ||
17cd3f37 | 3967 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 3968 | |
adb08ede VT |
3969 | if (result != L2CAP_IR_SUCCESS) { |
3970 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3971 | conn->info_ident = 0; | |
3972 | ||
3973 | l2cap_conn_start(conn); | |
3974 | ||
3975 | return 0; | |
3976 | } | |
3977 | ||
978c93b9 AE |
3978 | switch (type) { |
3979 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 3980 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3981 | |
47ec1dcd | 3982 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
3983 | struct l2cap_info_req req; |
3984 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3985 | ||
3986 | conn->info_ident = l2cap_get_ident(conn); | |
3987 | ||
3988 | l2cap_send_cmd(conn, conn->info_ident, | |
3989 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3990 | } else { | |
3991 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3992 | conn->info_ident = 0; | |
3993 | ||
3994 | l2cap_conn_start(conn); | |
3995 | } | |
978c93b9 AE |
3996 | break; |
3997 | ||
3998 | case L2CAP_IT_FIXED_CHAN: | |
3999 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 4000 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 4001 | conn->info_ident = 0; |
984947dc MH |
4002 | |
4003 | l2cap_conn_start(conn); | |
978c93b9 | 4004 | break; |
984947dc | 4005 | } |
4e8402a3 | 4006 | |
1da177e4 LT |
4007 | return 0; |
4008 | } | |
4009 | ||
f94ff6ff MM |
4010 | static inline int l2cap_create_channel_req(struct l2cap_conn *conn, |
4011 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
4012 | void *data) | |
4013 | { | |
4014 | struct l2cap_create_chan_req *req = data; | |
4015 | struct l2cap_create_chan_rsp rsp; | |
4016 | u16 psm, scid; | |
4017 | ||
4018 | if (cmd_len != sizeof(*req)) | |
4019 | return -EPROTO; | |
4020 | ||
4021 | if (!enable_hs) | |
4022 | return -EINVAL; | |
4023 | ||
4024 | psm = le16_to_cpu(req->psm); | |
4025 | scid = le16_to_cpu(req->scid); | |
4026 | ||
4027 | BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id); | |
4028 | ||
4029 | /* Placeholder: Always reject */ | |
4030 | rsp.dcid = 0; | |
4031 | rsp.scid = cpu_to_le16(scid); | |
8ce0c498 AE |
4032 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); |
4033 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f94ff6ff MM |
4034 | |
4035 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
4036 | sizeof(rsp), &rsp); | |
4037 | ||
4038 | return 0; | |
4039 | } | |
4040 | ||
4041 | static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn, | |
4042 | struct l2cap_cmd_hdr *cmd, void *data) | |
4043 | { | |
4044 | BT_DBG("conn %p", conn); | |
4045 | ||
4046 | return l2cap_connect_rsp(conn, cmd, data); | |
4047 | } | |
4048 | ||
8d5a04a1 MM |
4049 | static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, |
4050 | u16 icid, u16 result) | |
4051 | { | |
4052 | struct l2cap_move_chan_rsp rsp; | |
4053 | ||
4054 | BT_DBG("icid %d, result %d", icid, result); | |
4055 | ||
4056 | rsp.icid = cpu_to_le16(icid); | |
4057 | rsp.result = cpu_to_le16(result); | |
4058 | ||
4059 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); | |
4060 | } | |
4061 | ||
4062 | static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, | |
4063 | struct l2cap_chan *chan, u16 icid, u16 result) | |
4064 | { | |
4065 | struct l2cap_move_chan_cfm cfm; | |
4066 | u8 ident; | |
4067 | ||
4068 | BT_DBG("icid %d, result %d", icid, result); | |
4069 | ||
4070 | ident = l2cap_get_ident(conn); | |
4071 | if (chan) | |
4072 | chan->ident = ident; | |
4073 | ||
4074 | cfm.icid = cpu_to_le16(icid); | |
4075 | cfm.result = cpu_to_le16(result); | |
4076 | ||
4077 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); | |
4078 | } | |
4079 | ||
4080 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
4081 | u16 icid) | |
4082 | { | |
4083 | struct l2cap_move_chan_cfm_rsp rsp; | |
4084 | ||
4085 | BT_DBG("icid %d", icid); | |
4086 | ||
4087 | rsp.icid = cpu_to_le16(icid); | |
4088 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
4089 | } | |
4090 | ||
4091 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, | |
4092 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
4093 | { | |
4094 | struct l2cap_move_chan_req *req = data; | |
4095 | u16 icid = 0; | |
4096 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
4097 | ||
4098 | if (cmd_len != sizeof(*req)) | |
4099 | return -EPROTO; | |
4100 | ||
4101 | icid = le16_to_cpu(req->icid); | |
4102 | ||
4103 | BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id); | |
4104 | ||
4105 | if (!enable_hs) | |
4106 | return -EINVAL; | |
4107 | ||
4108 | /* Placeholder: Always refuse */ | |
4109 | l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); | |
4110 | ||
4111 | return 0; | |
4112 | } | |
4113 | ||
4114 | static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
4115 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
4116 | { | |
4117 | struct l2cap_move_chan_rsp *rsp = data; | |
4118 | u16 icid, result; | |
4119 | ||
4120 | if (cmd_len != sizeof(*rsp)) | |
4121 | return -EPROTO; | |
4122 | ||
4123 | icid = le16_to_cpu(rsp->icid); | |
4124 | result = le16_to_cpu(rsp->result); | |
4125 | ||
4126 | BT_DBG("icid %d, result %d", icid, result); | |
4127 | ||
4128 | /* Placeholder: Always unconfirmed */ | |
4129 | l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); | |
4130 | ||
4131 | return 0; | |
4132 | } | |
4133 | ||
4134 | static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, | |
4135 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
4136 | { | |
4137 | struct l2cap_move_chan_cfm *cfm = data; | |
4138 | u16 icid, result; | |
4139 | ||
4140 | if (cmd_len != sizeof(*cfm)) | |
4141 | return -EPROTO; | |
4142 | ||
4143 | icid = le16_to_cpu(cfm->icid); | |
4144 | result = le16_to_cpu(cfm->result); | |
4145 | ||
4146 | BT_DBG("icid %d, result %d", icid, result); | |
4147 | ||
4148 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
4149 | ||
4150 | return 0; | |
4151 | } | |
4152 | ||
4153 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
4154 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
4155 | { | |
4156 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
4157 | u16 icid; | |
4158 | ||
4159 | if (cmd_len != sizeof(*rsp)) | |
4160 | return -EPROTO; | |
4161 | ||
4162 | icid = le16_to_cpu(rsp->icid); | |
4163 | ||
4164 | BT_DBG("icid %d", icid); | |
4165 | ||
4166 | return 0; | |
4167 | } | |
4168 | ||
e2174ca4 | 4169 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
4170 | u16 to_multiplier) |
4171 | { | |
4172 | u16 max_latency; | |
4173 | ||
4174 | if (min > max || min < 6 || max > 3200) | |
4175 | return -EINVAL; | |
4176 | ||
4177 | if (to_multiplier < 10 || to_multiplier > 3200) | |
4178 | return -EINVAL; | |
4179 | ||
4180 | if (max >= to_multiplier * 8) | |
4181 | return -EINVAL; | |
4182 | ||
4183 | max_latency = (to_multiplier * 8 / max) - 1; | |
4184 | if (latency > 499 || latency > max_latency) | |
4185 | return -EINVAL; | |
4186 | ||
4187 | return 0; | |
4188 | } | |
4189 | ||
4190 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
4191 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4192 | { | |
4193 | struct hci_conn *hcon = conn->hcon; | |
4194 | struct l2cap_conn_param_update_req *req; | |
4195 | struct l2cap_conn_param_update_rsp rsp; | |
4196 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 4197 | int err; |
de73115a CT |
4198 | |
4199 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
4200 | return -EINVAL; | |
4201 | ||
4202 | cmd_len = __le16_to_cpu(cmd->len); | |
4203 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
4204 | return -EPROTO; | |
4205 | ||
4206 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
4207 | min = __le16_to_cpu(req->min); |
4208 | max = __le16_to_cpu(req->max); | |
de73115a CT |
4209 | latency = __le16_to_cpu(req->latency); |
4210 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
4211 | ||
4212 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
4213 | min, max, latency, to_multiplier); | |
4214 | ||
4215 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
4216 | |
4217 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
4218 | if (err) | |
de73115a CT |
4219 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
4220 | else | |
4221 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
4222 | ||
4223 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
4224 | sizeof(rsp), &rsp); | |
4225 | ||
2ce603eb CT |
4226 | if (!err) |
4227 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
4228 | ||
de73115a CT |
4229 | return 0; |
4230 | } | |
4231 | ||
3300d9a9 CT |
4232 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
4233 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
4234 | { | |
4235 | int err = 0; | |
4236 | ||
4237 | switch (cmd->code) { | |
4238 | case L2CAP_COMMAND_REJ: | |
4239 | l2cap_command_rej(conn, cmd, data); | |
4240 | break; | |
4241 | ||
4242 | case L2CAP_CONN_REQ: | |
4243 | err = l2cap_connect_req(conn, cmd, data); | |
4244 | break; | |
4245 | ||
4246 | case L2CAP_CONN_RSP: | |
4247 | err = l2cap_connect_rsp(conn, cmd, data); | |
4248 | break; | |
4249 | ||
4250 | case L2CAP_CONF_REQ: | |
4251 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
4252 | break; | |
4253 | ||
4254 | case L2CAP_CONF_RSP: | |
4255 | err = l2cap_config_rsp(conn, cmd, data); | |
4256 | break; | |
4257 | ||
4258 | case L2CAP_DISCONN_REQ: | |
4259 | err = l2cap_disconnect_req(conn, cmd, data); | |
4260 | break; | |
4261 | ||
4262 | case L2CAP_DISCONN_RSP: | |
4263 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
4264 | break; | |
4265 | ||
4266 | case L2CAP_ECHO_REQ: | |
4267 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
4268 | break; | |
4269 | ||
4270 | case L2CAP_ECHO_RSP: | |
4271 | break; | |
4272 | ||
4273 | case L2CAP_INFO_REQ: | |
4274 | err = l2cap_information_req(conn, cmd, data); | |
4275 | break; | |
4276 | ||
4277 | case L2CAP_INFO_RSP: | |
4278 | err = l2cap_information_rsp(conn, cmd, data); | |
4279 | break; | |
4280 | ||
f94ff6ff MM |
4281 | case L2CAP_CREATE_CHAN_REQ: |
4282 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
4283 | break; | |
4284 | ||
4285 | case L2CAP_CREATE_CHAN_RSP: | |
4286 | err = l2cap_create_channel_rsp(conn, cmd, data); | |
4287 | break; | |
4288 | ||
8d5a04a1 MM |
4289 | case L2CAP_MOVE_CHAN_REQ: |
4290 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
4291 | break; | |
4292 | ||
4293 | case L2CAP_MOVE_CHAN_RSP: | |
4294 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
4295 | break; | |
4296 | ||
4297 | case L2CAP_MOVE_CHAN_CFM: | |
4298 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
4299 | break; | |
4300 | ||
4301 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
4302 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
4303 | break; | |
4304 | ||
3300d9a9 CT |
4305 | default: |
4306 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
4307 | err = -EINVAL; | |
4308 | break; | |
4309 | } | |
4310 | ||
4311 | return err; | |
4312 | } | |
4313 | ||
4314 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
4315 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4316 | { | |
4317 | switch (cmd->code) { | |
4318 | case L2CAP_COMMAND_REJ: | |
4319 | return 0; | |
4320 | ||
4321 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 4322 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
4323 | |
4324 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
4325 | return 0; | |
4326 | ||
4327 | default: | |
4328 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
4329 | return -EINVAL; | |
4330 | } | |
4331 | } | |
4332 | ||
4333 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
4334 | struct sk_buff *skb) | |
1da177e4 LT |
4335 | { |
4336 | u8 *data = skb->data; | |
4337 | int len = skb->len; | |
4338 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 4339 | int err; |
1da177e4 LT |
4340 | |
4341 | l2cap_raw_recv(conn, skb); | |
4342 | ||
4343 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 4344 | u16 cmd_len; |
1da177e4 LT |
4345 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
4346 | data += L2CAP_CMD_HDR_SIZE; | |
4347 | len -= L2CAP_CMD_HDR_SIZE; | |
4348 | ||
88219a0f | 4349 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 4350 | |
88219a0f | 4351 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 4352 | |
88219a0f | 4353 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
4354 | BT_DBG("corrupted command"); |
4355 | break; | |
4356 | } | |
4357 | ||
3300d9a9 CT |
4358 | if (conn->hcon->type == LE_LINK) |
4359 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
4360 | else | |
4361 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
4362 | |
4363 | if (err) { | |
e2fd318e | 4364 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
4365 | |
4366 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
4367 | |
4368 | /* FIXME: Map err to a valid reason */ | |
e2fd318e | 4369 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
1da177e4 LT |
4370 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
4371 | } | |
4372 | ||
88219a0f AV |
4373 | data += cmd_len; |
4374 | len -= cmd_len; | |
1da177e4 LT |
4375 | } |
4376 | ||
4377 | kfree_skb(skb); | |
4378 | } | |
4379 | ||
47d1ec61 | 4380 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
4381 | { |
4382 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
4383 | int hdr_size; |
4384 | ||
4385 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
4386 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
4387 | else | |
4388 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 4389 | |
47d1ec61 | 4390 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 4391 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
4392 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
4393 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
4394 | ||
4395 | if (our_fcs != rcv_fcs) | |
7a560e5c | 4396 | return -EBADMSG; |
fcc203c3 GP |
4397 | } |
4398 | return 0; | |
4399 | } | |
4400 | ||
525cd185 | 4401 | static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 4402 | { |
e31f7633 | 4403 | struct l2cap_ctrl control; |
d5392c8f | 4404 | |
e31f7633 | 4405 | BT_DBG("chan %p", chan); |
d5392c8f | 4406 | |
e31f7633 MM |
4407 | memset(&control, 0, sizeof(control)); |
4408 | control.sframe = 1; | |
4409 | control.final = 1; | |
4410 | control.reqseq = chan->buffer_seq; | |
4411 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
d5392c8f | 4412 | |
e2ab4353 | 4413 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
e31f7633 MM |
4414 | control.super = L2CAP_SUPER_RNR; |
4415 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
4416 | } |
4417 | ||
e31f7633 MM |
4418 | if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
4419 | chan->unacked_frames > 0) | |
4420 | __set_retrans_timer(chan); | |
d5392c8f | 4421 | |
e31f7633 | 4422 | /* Send pending iframes */ |
525cd185 | 4423 | l2cap_ertm_send(chan); |
d5392c8f | 4424 | |
e2ab4353 | 4425 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
e31f7633 MM |
4426 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
4427 | /* F-bit wasn't sent in an s-frame or i-frame yet, so | |
4428 | * send it now. | |
4429 | */ | |
4430 | control.super = L2CAP_SUPER_RR; | |
4431 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
4432 | } |
4433 | } | |
4434 | ||
84084a31 MM |
4435 | static void append_skb_frag(struct sk_buff *skb, |
4436 | struct sk_buff *new_frag, struct sk_buff **last_frag) | |
18778a63 | 4437 | { |
84084a31 MM |
4438 | /* skb->len reflects data in skb as well as all fragments |
4439 | * skb->data_len reflects only data in fragments | |
4440 | */ | |
4441 | if (!skb_has_frag_list(skb)) | |
4442 | skb_shinfo(skb)->frag_list = new_frag; | |
4443 | ||
4444 | new_frag->next = NULL; | |
4445 | ||
4446 | (*last_frag)->next = new_frag; | |
4447 | *last_frag = new_frag; | |
4448 | ||
4449 | skb->len += new_frag->len; | |
4450 | skb->data_len += new_frag->len; | |
4451 | skb->truesize += new_frag->truesize; | |
4452 | } | |
4453 | ||
4b51dae9 MM |
4454 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
4455 | struct l2cap_ctrl *control) | |
84084a31 MM |
4456 | { |
4457 | int err = -EINVAL; | |
18778a63 | 4458 | |
4b51dae9 | 4459 | switch (control->sar) { |
7e0ef6ee | 4460 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
4461 | if (chan->sdu) |
4462 | break; | |
18778a63 | 4463 | |
84084a31 MM |
4464 | err = chan->ops->recv(chan->data, skb); |
4465 | break; | |
18778a63 | 4466 | |
7e0ef6ee | 4467 | case L2CAP_SAR_START: |
84084a31 MM |
4468 | if (chan->sdu) |
4469 | break; | |
18778a63 | 4470 | |
6f61fd47 | 4471 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 4472 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 4473 | |
84084a31 MM |
4474 | if (chan->sdu_len > chan->imtu) { |
4475 | err = -EMSGSIZE; | |
4476 | break; | |
4477 | } | |
1890d36b | 4478 | |
84084a31 MM |
4479 | if (skb->len >= chan->sdu_len) |
4480 | break; | |
18778a63 | 4481 | |
84084a31 MM |
4482 | chan->sdu = skb; |
4483 | chan->sdu_last_frag = skb; | |
18778a63 | 4484 | |
84084a31 MM |
4485 | skb = NULL; |
4486 | err = 0; | |
18778a63 GP |
4487 | break; |
4488 | ||
7e0ef6ee | 4489 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 4490 | if (!chan->sdu) |
84084a31 | 4491 | break; |
18778a63 | 4492 | |
84084a31 MM |
4493 | append_skb_frag(chan->sdu, skb, |
4494 | &chan->sdu_last_frag); | |
4495 | skb = NULL; | |
18778a63 | 4496 | |
84084a31 MM |
4497 | if (chan->sdu->len >= chan->sdu_len) |
4498 | break; | |
4178ba46 | 4499 | |
84084a31 | 4500 | err = 0; |
18778a63 GP |
4501 | break; |
4502 | ||
7e0ef6ee | 4503 | case L2CAP_SAR_END: |
6f61fd47 | 4504 | if (!chan->sdu) |
84084a31 | 4505 | break; |
18778a63 | 4506 | |
84084a31 MM |
4507 | append_skb_frag(chan->sdu, skb, |
4508 | &chan->sdu_last_frag); | |
4509 | skb = NULL; | |
4178ba46 | 4510 | |
84084a31 MM |
4511 | if (chan->sdu->len != chan->sdu_len) |
4512 | break; | |
18778a63 | 4513 | |
84084a31 | 4514 | err = chan->ops->recv(chan->data, chan->sdu); |
1890d36b | 4515 | |
84084a31 MM |
4516 | if (!err) { |
4517 | /* Reassembly complete */ | |
4518 | chan->sdu = NULL; | |
4519 | chan->sdu_last_frag = NULL; | |
4520 | chan->sdu_len = 0; | |
1890d36b | 4521 | } |
18778a63 GP |
4522 | break; |
4523 | } | |
4524 | ||
84084a31 MM |
4525 | if (err) { |
4526 | kfree_skb(skb); | |
4527 | kfree_skb(chan->sdu); | |
4528 | chan->sdu = NULL; | |
4529 | chan->sdu_last_frag = NULL; | |
4530 | chan->sdu_len = 0; | |
4531 | } | |
18778a63 | 4532 | |
84084a31 | 4533 | return err; |
18778a63 GP |
4534 | } |
4535 | ||
61aa4f5b | 4536 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
26f880d2 | 4537 | { |
61aa4f5b | 4538 | u8 event; |
712132eb | 4539 | |
61aa4f5b MM |
4540 | if (chan->mode != L2CAP_MODE_ERTM) |
4541 | return; | |
712132eb | 4542 | |
61aa4f5b MM |
4543 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
4544 | l2cap_tx(chan, 0, 0, event); | |
1890d36b GP |
4545 | } |
4546 | ||
d2a7ac5d MM |
4547 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
4548 | { | |
63838725 MM |
4549 | int err = 0; |
4550 | /* Pass sequential frames to l2cap_reassemble_sdu() | |
4551 | * until a gap is encountered. | |
4552 | */ | |
4553 | ||
4554 | BT_DBG("chan %p", chan); | |
4555 | ||
4556 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4557 | struct sk_buff *skb; | |
4558 | BT_DBG("Searching for skb with txseq %d (queue len %d)", | |
4559 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); | |
4560 | ||
4561 | skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); | |
4562 | ||
4563 | if (!skb) | |
4564 | break; | |
4565 | ||
4566 | skb_unlink(skb, &chan->srej_q); | |
4567 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
4568 | err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); | |
4569 | if (err) | |
4570 | break; | |
4571 | } | |
4572 | ||
4573 | if (skb_queue_empty(&chan->srej_q)) { | |
4574 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
4575 | l2cap_send_ack(chan); | |
4576 | } | |
4577 | ||
4578 | return err; | |
d2a7ac5d MM |
4579 | } |
4580 | ||
4581 | static void l2cap_handle_srej(struct l2cap_chan *chan, | |
4582 | struct l2cap_ctrl *control) | |
4583 | { | |
f80842a8 MM |
4584 | struct sk_buff *skb; |
4585 | ||
4586 | BT_DBG("chan %p, control %p", chan, control); | |
4587 | ||
4588 | if (control->reqseq == chan->next_tx_seq) { | |
4589 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
4590 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4591 | return; | |
4592 | } | |
4593 | ||
4594 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
4595 | ||
4596 | if (skb == NULL) { | |
4597 | BT_DBG("Seq %d not available for retransmission", | |
4598 | control->reqseq); | |
4599 | return; | |
4600 | } | |
4601 | ||
4602 | if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { | |
4603 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
4604 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4605 | return; | |
4606 | } | |
4607 | ||
4608 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4609 | ||
4610 | if (control->poll) { | |
4611 | l2cap_pass_to_tx(chan, control); | |
4612 | ||
4613 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4614 | l2cap_retransmit(chan, control); | |
4615 | l2cap_ertm_send(chan); | |
4616 | ||
4617 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
4618 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4619 | chan->srej_save_reqseq = control->reqseq; | |
4620 | } | |
4621 | } else { | |
4622 | l2cap_pass_to_tx_fbit(chan, control); | |
4623 | ||
4624 | if (control->final) { | |
4625 | if (chan->srej_save_reqseq != control->reqseq || | |
4626 | !test_and_clear_bit(CONN_SREJ_ACT, | |
4627 | &chan->conn_state)) | |
4628 | l2cap_retransmit(chan, control); | |
4629 | } else { | |
4630 | l2cap_retransmit(chan, control); | |
4631 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
4632 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4633 | chan->srej_save_reqseq = control->reqseq; | |
4634 | } | |
4635 | } | |
4636 | } | |
d2a7ac5d MM |
4637 | } |
4638 | ||
4639 | static void l2cap_handle_rej(struct l2cap_chan *chan, | |
4640 | struct l2cap_ctrl *control) | |
4641 | { | |
fcd289df MM |
4642 | struct sk_buff *skb; |
4643 | ||
4644 | BT_DBG("chan %p, control %p", chan, control); | |
4645 | ||
4646 | if (control->reqseq == chan->next_tx_seq) { | |
4647 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
4648 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4649 | return; | |
4650 | } | |
4651 | ||
4652 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
4653 | ||
4654 | if (chan->max_tx && skb && | |
4655 | bt_cb(skb)->control.retries >= chan->max_tx) { | |
4656 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
4657 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4658 | return; | |
4659 | } | |
4660 | ||
4661 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4662 | ||
4663 | l2cap_pass_to_tx(chan, control); | |
4664 | ||
4665 | if (control->final) { | |
4666 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) | |
4667 | l2cap_retransmit_all(chan, control); | |
4668 | } else { | |
4669 | l2cap_retransmit_all(chan, control); | |
4670 | l2cap_ertm_send(chan); | |
4671 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) | |
4672 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
4673 | } | |
d2a7ac5d MM |
4674 | } |
4675 | ||
4b51dae9 MM |
4676 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
4677 | { | |
4678 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
4679 | ||
4680 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
4681 | chan->expected_tx_seq); | |
4682 | ||
4683 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
4684 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
4685 | chan->tx_win) { | |
4686 | /* See notes below regarding "double poll" and | |
4687 | * invalid packets. | |
4688 | */ | |
4689 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4690 | BT_DBG("Invalid/Ignore - after SREJ"); | |
4691 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4692 | } else { | |
4693 | BT_DBG("Invalid - in window after SREJ sent"); | |
4694 | return L2CAP_TXSEQ_INVALID; | |
4695 | } | |
4696 | } | |
4697 | ||
4698 | if (chan->srej_list.head == txseq) { | |
4699 | BT_DBG("Expected SREJ"); | |
4700 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
4701 | } | |
4702 | ||
4703 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
4704 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
4705 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
4706 | } | |
4707 | ||
4708 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
4709 | BT_DBG("Unexpected SREJ - not requested"); | |
4710 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
4711 | } | |
4712 | } | |
4713 | ||
4714 | if (chan->expected_tx_seq == txseq) { | |
4715 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
4716 | chan->tx_win) { | |
4717 | BT_DBG("Invalid - txseq outside tx window"); | |
4718 | return L2CAP_TXSEQ_INVALID; | |
4719 | } else { | |
4720 | BT_DBG("Expected"); | |
4721 | return L2CAP_TXSEQ_EXPECTED; | |
4722 | } | |
4723 | } | |
4724 | ||
4725 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
4726 | __seq_offset(chan, chan->expected_tx_seq, | |
4727 | chan->last_acked_seq)){ | |
4728 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); | |
4729 | return L2CAP_TXSEQ_DUPLICATE; | |
4730 | } | |
4731 | ||
4732 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
4733 | /* A source of invalid packets is a "double poll" condition, | |
4734 | * where delays cause us to send multiple poll packets. If | |
4735 | * the remote stack receives and processes both polls, | |
4736 | * sequence numbers can wrap around in such a way that a | |
4737 | * resent frame has a sequence number that looks like new data | |
4738 | * with a sequence gap. This would trigger an erroneous SREJ | |
4739 | * request. | |
4740 | * | |
4741 | * Fortunately, this is impossible with a tx window that's | |
4742 | * less than half of the maximum sequence number, which allows | |
4743 | * invalid frames to be safely ignored. | |
4744 | * | |
4745 | * With tx window sizes greater than half of the tx window | |
4746 | * maximum, the frame is invalid and cannot be ignored. This | |
4747 | * causes a disconnect. | |
4748 | */ | |
4749 | ||
4750 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4751 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
4752 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4753 | } else { | |
4754 | BT_DBG("Invalid - txseq outside tx window"); | |
4755 | return L2CAP_TXSEQ_INVALID; | |
4756 | } | |
4757 | } else { | |
4758 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
4759 | return L2CAP_TXSEQ_UNEXPECTED; | |
4760 | } | |
4761 | } | |
4762 | ||
d2a7ac5d MM |
4763 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
4764 | struct l2cap_ctrl *control, | |
4765 | struct sk_buff *skb, u8 event) | |
4766 | { | |
4767 | int err = 0; | |
4768 | bool skb_in_use = 0; | |
4769 | ||
4770 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
4771 | event); | |
4772 | ||
4773 | switch (event) { | |
4774 | case L2CAP_EV_RECV_IFRAME: | |
4775 | switch (l2cap_classify_txseq(chan, control->txseq)) { | |
4776 | case L2CAP_TXSEQ_EXPECTED: | |
4777 | l2cap_pass_to_tx(chan, control); | |
4778 | ||
4779 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4780 | BT_DBG("Busy, discarding expected seq %d", | |
4781 | control->txseq); | |
4782 | break; | |
4783 | } | |
4784 | ||
4785 | chan->expected_tx_seq = __next_seq(chan, | |
4786 | control->txseq); | |
4787 | ||
4788 | chan->buffer_seq = chan->expected_tx_seq; | |
4789 | skb_in_use = 1; | |
4790 | ||
4791 | err = l2cap_reassemble_sdu(chan, skb, control); | |
4792 | if (err) | |
4793 | break; | |
4794 | ||
4795 | if (control->final) { | |
4796 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4797 | &chan->conn_state)) { | |
4798 | control->final = 0; | |
4799 | l2cap_retransmit_all(chan, control); | |
4800 | l2cap_ertm_send(chan); | |
4801 | } | |
4802 | } | |
4803 | ||
4804 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
4805 | l2cap_send_ack(chan); | |
4806 | break; | |
4807 | case L2CAP_TXSEQ_UNEXPECTED: | |
4808 | l2cap_pass_to_tx(chan, control); | |
4809 | ||
4810 | /* Can't issue SREJ frames in the local busy state. | |
4811 | * Drop this frame, it will be seen as missing | |
4812 | * when local busy is exited. | |
4813 | */ | |
4814 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4815 | BT_DBG("Busy, discarding unexpected seq %d", | |
4816 | control->txseq); | |
4817 | break; | |
4818 | } | |
4819 | ||
4820 | /* There was a gap in the sequence, so an SREJ | |
4821 | * must be sent for each missing frame. The | |
4822 | * current frame is stored for later use. | |
4823 | */ | |
4824 | skb_queue_tail(&chan->srej_q, skb); | |
4825 | skb_in_use = 1; | |
4826 | BT_DBG("Queued %p (queue len %d)", skb, | |
4827 | skb_queue_len(&chan->srej_q)); | |
4828 | ||
4829 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4830 | l2cap_seq_list_clear(&chan->srej_list); | |
4831 | l2cap_send_srej(chan, control->txseq); | |
4832 | ||
4833 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; | |
4834 | break; | |
4835 | case L2CAP_TXSEQ_DUPLICATE: | |
4836 | l2cap_pass_to_tx(chan, control); | |
4837 | break; | |
4838 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
4839 | break; | |
4840 | case L2CAP_TXSEQ_INVALID: | |
4841 | default: | |
4842 | l2cap_send_disconn_req(chan->conn, chan, | |
4843 | ECONNRESET); | |
4844 | break; | |
4845 | } | |
4846 | break; | |
4847 | case L2CAP_EV_RECV_RR: | |
4848 | l2cap_pass_to_tx(chan, control); | |
4849 | if (control->final) { | |
4850 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4851 | ||
4852 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4853 | &chan->conn_state)) { | |
4854 | control->final = 0; | |
4855 | l2cap_retransmit_all(chan, control); | |
4856 | } | |
4857 | ||
4858 | l2cap_ertm_send(chan); | |
4859 | } else if (control->poll) { | |
4860 | l2cap_send_i_or_rr_or_rnr(chan); | |
4861 | } else { | |
4862 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4863 | &chan->conn_state) && | |
4864 | chan->unacked_frames) | |
4865 | __set_retrans_timer(chan); | |
4866 | ||
4867 | l2cap_ertm_send(chan); | |
4868 | } | |
4869 | break; | |
4870 | case L2CAP_EV_RECV_RNR: | |
4871 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4872 | l2cap_pass_to_tx(chan, control); | |
4873 | if (control && control->poll) { | |
4874 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4875 | l2cap_send_rr_or_rnr(chan, 0); | |
4876 | } | |
4877 | __clear_retrans_timer(chan); | |
4878 | l2cap_seq_list_clear(&chan->retrans_list); | |
4879 | break; | |
4880 | case L2CAP_EV_RECV_REJ: | |
4881 | l2cap_handle_rej(chan, control); | |
4882 | break; | |
4883 | case L2CAP_EV_RECV_SREJ: | |
4884 | l2cap_handle_srej(chan, control); | |
4885 | break; | |
4886 | default: | |
4887 | break; | |
4888 | } | |
4889 | ||
4890 | if (skb && !skb_in_use) { | |
4891 | BT_DBG("Freeing %p", skb); | |
4892 | kfree_skb(skb); | |
4893 | } | |
4894 | ||
4895 | return err; | |
4896 | } | |
4897 | ||
4898 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, | |
4899 | struct l2cap_ctrl *control, | |
4900 | struct sk_buff *skb, u8 event) | |
4901 | { | |
4902 | int err = 0; | |
4903 | u16 txseq = control->txseq; | |
4904 | bool skb_in_use = 0; | |
4905 | ||
4906 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
4907 | event); | |
4908 | ||
4909 | switch (event) { | |
4910 | case L2CAP_EV_RECV_IFRAME: | |
4911 | switch (l2cap_classify_txseq(chan, txseq)) { | |
4912 | case L2CAP_TXSEQ_EXPECTED: | |
4913 | /* Keep frame for reassembly later */ | |
4914 | l2cap_pass_to_tx(chan, control); | |
4915 | skb_queue_tail(&chan->srej_q, skb); | |
4916 | skb_in_use = 1; | |
4917 | BT_DBG("Queued %p (queue len %d)", skb, | |
4918 | skb_queue_len(&chan->srej_q)); | |
4919 | ||
4920 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
4921 | break; | |
4922 | case L2CAP_TXSEQ_EXPECTED_SREJ: | |
4923 | l2cap_seq_list_pop(&chan->srej_list); | |
4924 | ||
4925 | l2cap_pass_to_tx(chan, control); | |
4926 | skb_queue_tail(&chan->srej_q, skb); | |
4927 | skb_in_use = 1; | |
4928 | BT_DBG("Queued %p (queue len %d)", skb, | |
4929 | skb_queue_len(&chan->srej_q)); | |
4930 | ||
4931 | err = l2cap_rx_queued_iframes(chan); | |
4932 | if (err) | |
4933 | break; | |
4934 | ||
4935 | break; | |
4936 | case L2CAP_TXSEQ_UNEXPECTED: | |
4937 | /* Got a frame that can't be reassembled yet. | |
4938 | * Save it for later, and send SREJs to cover | |
4939 | * the missing frames. | |
4940 | */ | |
4941 | skb_queue_tail(&chan->srej_q, skb); | |
4942 | skb_in_use = 1; | |
4943 | BT_DBG("Queued %p (queue len %d)", skb, | |
4944 | skb_queue_len(&chan->srej_q)); | |
4945 | ||
4946 | l2cap_pass_to_tx(chan, control); | |
4947 | l2cap_send_srej(chan, control->txseq); | |
4948 | break; | |
4949 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: | |
4950 | /* This frame was requested with an SREJ, but | |
4951 | * some expected retransmitted frames are | |
4952 | * missing. Request retransmission of missing | |
4953 | * SREJ'd frames. | |
4954 | */ | |
4955 | skb_queue_tail(&chan->srej_q, skb); | |
4956 | skb_in_use = 1; | |
4957 | BT_DBG("Queued %p (queue len %d)", skb, | |
4958 | skb_queue_len(&chan->srej_q)); | |
4959 | ||
4960 | l2cap_pass_to_tx(chan, control); | |
4961 | l2cap_send_srej_list(chan, control->txseq); | |
4962 | break; | |
4963 | case L2CAP_TXSEQ_DUPLICATE_SREJ: | |
4964 | /* We've already queued this frame. Drop this copy. */ | |
4965 | l2cap_pass_to_tx(chan, control); | |
4966 | break; | |
4967 | case L2CAP_TXSEQ_DUPLICATE: | |
4968 | /* Expecting a later sequence number, so this frame | |
4969 | * was already received. Ignore it completely. | |
4970 | */ | |
4971 | break; | |
4972 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
4973 | break; | |
4974 | case L2CAP_TXSEQ_INVALID: | |
4975 | default: | |
4976 | l2cap_send_disconn_req(chan->conn, chan, | |
4977 | ECONNRESET); | |
4978 | break; | |
4979 | } | |
4980 | break; | |
4981 | case L2CAP_EV_RECV_RR: | |
4982 | l2cap_pass_to_tx(chan, control); | |
4983 | if (control->final) { | |
4984 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4985 | ||
4986 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4987 | &chan->conn_state)) { | |
4988 | control->final = 0; | |
4989 | l2cap_retransmit_all(chan, control); | |
4990 | } | |
4991 | ||
4992 | l2cap_ertm_send(chan); | |
4993 | } else if (control->poll) { | |
4994 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4995 | &chan->conn_state) && | |
4996 | chan->unacked_frames) { | |
4997 | __set_retrans_timer(chan); | |
4998 | } | |
4999 | ||
5000 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
5001 | l2cap_send_srej_tail(chan); | |
5002 | } else { | |
5003 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
5004 | &chan->conn_state) && | |
5005 | chan->unacked_frames) | |
5006 | __set_retrans_timer(chan); | |
5007 | ||
5008 | l2cap_send_ack(chan); | |
5009 | } | |
5010 | break; | |
5011 | case L2CAP_EV_RECV_RNR: | |
5012 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5013 | l2cap_pass_to_tx(chan, control); | |
5014 | if (control->poll) { | |
5015 | l2cap_send_srej_tail(chan); | |
5016 | } else { | |
5017 | struct l2cap_ctrl rr_control; | |
5018 | memset(&rr_control, 0, sizeof(rr_control)); | |
5019 | rr_control.sframe = 1; | |
5020 | rr_control.super = L2CAP_SUPER_RR; | |
5021 | rr_control.reqseq = chan->buffer_seq; | |
5022 | l2cap_send_sframe(chan, &rr_control); | |
5023 | } | |
5024 | ||
5025 | break; | |
5026 | case L2CAP_EV_RECV_REJ: | |
5027 | l2cap_handle_rej(chan, control); | |
5028 | break; | |
5029 | case L2CAP_EV_RECV_SREJ: | |
5030 | l2cap_handle_srej(chan, control); | |
5031 | break; | |
5032 | } | |
5033 | ||
5034 | if (skb && !skb_in_use) { | |
5035 | BT_DBG("Freeing %p", skb); | |
5036 | kfree_skb(skb); | |
5037 | } | |
5038 | ||
5039 | return err; | |
5040 | } | |
5041 | ||
5042 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) | |
5043 | { | |
5044 | /* Make sure reqseq is for a packet that has been sent but not acked */ | |
5045 | u16 unacked; | |
5046 | ||
5047 | unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); | |
5048 | return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; | |
5049 | } | |
5050 | ||
cec8ab6e MM |
5051 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
5052 | struct sk_buff *skb, u8 event) | |
218bb9df | 5053 | { |
d2a7ac5d MM |
5054 | int err = 0; |
5055 | ||
5056 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, | |
5057 | control, skb, event, chan->rx_state); | |
5058 | ||
5059 | if (__valid_reqseq(chan, control->reqseq)) { | |
5060 | switch (chan->rx_state) { | |
5061 | case L2CAP_RX_STATE_RECV: | |
5062 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
5063 | break; | |
5064 | case L2CAP_RX_STATE_SREJ_SENT: | |
5065 | err = l2cap_rx_state_srej_sent(chan, control, skb, | |
5066 | event); | |
5067 | break; | |
5068 | default: | |
5069 | /* shut it down */ | |
5070 | break; | |
5071 | } | |
5072 | } else { | |
5073 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", | |
5074 | control->reqseq, chan->next_tx_seq, | |
5075 | chan->expected_ack_seq); | |
5076 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
5077 | } | |
5078 | ||
5079 | return err; | |
cec8ab6e MM |
5080 | } |
5081 | ||
5082 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
5083 | struct sk_buff *skb) | |
5084 | { | |
4b51dae9 MM |
5085 | int err = 0; |
5086 | ||
5087 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, | |
5088 | chan->rx_state); | |
5089 | ||
5090 | if (l2cap_classify_txseq(chan, control->txseq) == | |
5091 | L2CAP_TXSEQ_EXPECTED) { | |
5092 | l2cap_pass_to_tx(chan, control); | |
5093 | ||
5094 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
5095 | __next_seq(chan, chan->buffer_seq)); | |
5096 | ||
5097 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
5098 | ||
5099 | l2cap_reassemble_sdu(chan, skb, control); | |
5100 | } else { | |
5101 | if (chan->sdu) { | |
5102 | kfree_skb(chan->sdu); | |
5103 | chan->sdu = NULL; | |
5104 | } | |
5105 | chan->sdu_last_frag = NULL; | |
5106 | chan->sdu_len = 0; | |
5107 | ||
5108 | if (skb) { | |
5109 | BT_DBG("Freeing %p", skb); | |
5110 | kfree_skb(skb); | |
5111 | } | |
5112 | } | |
5113 | ||
5114 | chan->last_acked_seq = control->txseq; | |
5115 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
5116 | ||
5117 | return err; | |
cec8ab6e MM |
5118 | } |
5119 | ||
5120 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
5121 | { | |
5122 | struct l2cap_ctrl *control = &bt_cb(skb)->control; | |
5123 | u16 len; | |
5124 | u8 event; | |
218bb9df | 5125 | |
b76bbd66 MM |
5126 | __unpack_control(chan, skb); |
5127 | ||
218bb9df GP |
5128 | len = skb->len; |
5129 | ||
5130 | /* | |
5131 | * We can just drop the corrupted I-frame here. | |
5132 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 5133 | * procedures and ask for retransmission. |
218bb9df | 5134 | */ |
47d1ec61 | 5135 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
5136 | goto drop; |
5137 | ||
cec8ab6e | 5138 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 5139 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 5140 | |
47d1ec61 | 5141 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 5142 | len -= L2CAP_FCS_SIZE; |
218bb9df | 5143 | |
47d1ec61 | 5144 | if (len > chan->mps) { |
8c1d787b | 5145 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5146 | goto drop; |
5147 | } | |
5148 | ||
cec8ab6e MM |
5149 | if (!control->sframe) { |
5150 | int err; | |
218bb9df | 5151 | |
cec8ab6e MM |
5152 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
5153 | control->sar, control->reqseq, control->final, | |
5154 | control->txseq); | |
218bb9df | 5155 | |
cec8ab6e MM |
5156 | /* Validate F-bit - F=0 always valid, F=1 only |
5157 | * valid in TX WAIT_F | |
5158 | */ | |
5159 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 5160 | goto drop; |
cec8ab6e MM |
5161 | |
5162 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
5163 | event = L2CAP_EV_RECV_IFRAME; | |
5164 | err = l2cap_rx(chan, control, skb, event); | |
5165 | } else { | |
5166 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
5167 | } |
5168 | ||
cec8ab6e MM |
5169 | if (err) |
5170 | l2cap_send_disconn_req(chan->conn, chan, | |
5171 | ECONNRESET); | |
218bb9df | 5172 | } else { |
cec8ab6e MM |
5173 | const u8 rx_func_to_event[4] = { |
5174 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
5175 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
5176 | }; | |
5177 | ||
5178 | /* Only I-frames are expected in streaming mode */ | |
5179 | if (chan->mode == L2CAP_MODE_STREAMING) | |
5180 | goto drop; | |
5181 | ||
5182 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
5183 | control->reqseq, control->final, control->poll, | |
5184 | control->super); | |
5185 | ||
218bb9df GP |
5186 | if (len != 0) { |
5187 | BT_ERR("%d", len); | |
8c1d787b | 5188 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5189 | goto drop; |
5190 | } | |
5191 | ||
cec8ab6e MM |
5192 | /* Validate F and P bits */ |
5193 | if (control->final && (control->poll || | |
5194 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
5195 | goto drop; | |
5196 | ||
5197 | event = rx_func_to_event[control->super]; | |
5198 | if (l2cap_rx(chan, control, skb, event)) | |
5199 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
218bb9df GP |
5200 | } |
5201 | ||
5202 | return 0; | |
5203 | ||
5204 | drop: | |
5205 | kfree_skb(skb); | |
5206 | return 0; | |
5207 | } | |
5208 | ||
1da177e4 LT |
5209 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
5210 | { | |
48454079 | 5211 | struct l2cap_chan *chan; |
1da177e4 | 5212 | |
baa7e1fa | 5213 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 5214 | if (!chan) { |
1da177e4 | 5215 | BT_DBG("unknown cid 0x%4.4x", cid); |
6be36555 | 5216 | /* Drop packet and return */ |
3379013b | 5217 | kfree_skb(skb); |
6be36555 | 5218 | return 0; |
1da177e4 LT |
5219 | } |
5220 | ||
49208c9c | 5221 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 5222 | |
89bc500e | 5223 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
5224 | goto drop; |
5225 | ||
0c1bc5c6 | 5226 | switch (chan->mode) { |
1c2acffb GP |
5227 | case L2CAP_MODE_BASIC: |
5228 | /* If socket recv buffers overflows we drop data here | |
5229 | * which is *bad* because L2CAP has to be reliable. | |
5230 | * But we don't have any other choice. L2CAP doesn't | |
5231 | * provide flow control mechanism. */ | |
1da177e4 | 5232 | |
0c1bc5c6 | 5233 | if (chan->imtu < skb->len) |
1c2acffb | 5234 | goto drop; |
1da177e4 | 5235 | |
23070494 | 5236 | if (!chan->ops->recv(chan->data, skb)) |
1c2acffb GP |
5237 | goto done; |
5238 | break; | |
5239 | ||
5240 | case L2CAP_MODE_ERTM: | |
6840ed07 | 5241 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 5242 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
5243 | goto done; |
5244 | ||
1c2acffb | 5245 | default: |
0c1bc5c6 | 5246 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
5247 | break; |
5248 | } | |
1da177e4 LT |
5249 | |
5250 | drop: | |
5251 | kfree_skb(skb); | |
5252 | ||
5253 | done: | |
6be36555 | 5254 | l2cap_chan_unlock(chan); |
0139418c | 5255 | |
1da177e4 LT |
5256 | return 0; |
5257 | } | |
5258 | ||
8e036fc3 | 5259 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 | 5260 | { |
23691d75 | 5261 | struct l2cap_chan *chan; |
1da177e4 | 5262 | |
c2287681 | 5263 | chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); |
23691d75 | 5264 | if (!chan) |
1da177e4 LT |
5265 | goto drop; |
5266 | ||
5b4cedaa | 5267 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 5268 | |
89bc500e | 5269 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
5270 | goto drop; |
5271 | ||
e13e21dc | 5272 | if (chan->imtu < skb->len) |
1da177e4 LT |
5273 | goto drop; |
5274 | ||
23070494 | 5275 | if (!chan->ops->recv(chan->data, skb)) |
5b4cedaa | 5276 | return 0; |
1da177e4 LT |
5277 | |
5278 | drop: | |
5279 | kfree_skb(skb); | |
5280 | ||
1da177e4 LT |
5281 | return 0; |
5282 | } | |
5283 | ||
d9b88702 AE |
5284 | static inline int l2cap_att_channel(struct l2cap_conn *conn, u16 cid, |
5285 | struct sk_buff *skb) | |
9f69bda6 | 5286 | { |
23691d75 | 5287 | struct l2cap_chan *chan; |
9f69bda6 | 5288 | |
c2287681 | 5289 | chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst); |
23691d75 | 5290 | if (!chan) |
9f69bda6 GP |
5291 | goto drop; |
5292 | ||
5b4cedaa | 5293 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 5294 | |
89bc500e | 5295 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
5296 | goto drop; |
5297 | ||
e13e21dc | 5298 | if (chan->imtu < skb->len) |
9f69bda6 GP |
5299 | goto drop; |
5300 | ||
23070494 | 5301 | if (!chan->ops->recv(chan->data, skb)) |
5b4cedaa | 5302 | return 0; |
9f69bda6 GP |
5303 | |
5304 | drop: | |
5305 | kfree_skb(skb); | |
5306 | ||
9f69bda6 GP |
5307 | return 0; |
5308 | } | |
5309 | ||
1da177e4 LT |
5310 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
5311 | { | |
5312 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
5313 | u16 cid, len; |
5314 | __le16 psm; | |
1da177e4 LT |
5315 | |
5316 | skb_pull(skb, L2CAP_HDR_SIZE); | |
5317 | cid = __le16_to_cpu(lh->cid); | |
5318 | len = __le16_to_cpu(lh->len); | |
5319 | ||
1c2acffb GP |
5320 | if (len != skb->len) { |
5321 | kfree_skb(skb); | |
5322 | return; | |
5323 | } | |
5324 | ||
1da177e4 LT |
5325 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
5326 | ||
5327 | switch (cid) { | |
3300d9a9 | 5328 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 5329 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
5330 | l2cap_sig_channel(conn, skb); |
5331 | break; | |
5332 | ||
8db4dc46 | 5333 | case L2CAP_CID_CONN_LESS: |
097db76c | 5334 | psm = get_unaligned((__le16 *) skb->data); |
1da177e4 LT |
5335 | skb_pull(skb, 2); |
5336 | l2cap_conless_channel(conn, psm, skb); | |
5337 | break; | |
5338 | ||
9f69bda6 GP |
5339 | case L2CAP_CID_LE_DATA: |
5340 | l2cap_att_channel(conn, cid, skb); | |
5341 | break; | |
5342 | ||
b501d6a1 AB |
5343 | case L2CAP_CID_SMP: |
5344 | if (smp_sig_channel(conn, skb)) | |
5345 | l2cap_conn_del(conn->hcon, EACCES); | |
5346 | break; | |
5347 | ||
1da177e4 LT |
5348 | default: |
5349 | l2cap_data_channel(conn, cid, skb); | |
5350 | break; | |
5351 | } | |
5352 | } | |
5353 | ||
5354 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
5355 | ||
686ebf28 | 5356 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
5357 | { |
5358 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 5359 | struct l2cap_chan *c; |
1da177e4 | 5360 | |
1da177e4 LT |
5361 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); |
5362 | ||
5363 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
5364 | read_lock(&chan_list_lock); |
5365 | list_for_each_entry(c, &chan_list, global_l) { | |
5366 | struct sock *sk = c->sk; | |
4343478f | 5367 | |
89bc500e | 5368 | if (c->state != BT_LISTEN) |
1da177e4 LT |
5369 | continue; |
5370 | ||
5371 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 5372 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 5373 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 5374 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 5375 | exact++; |
2af6b9d5 MH |
5376 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
5377 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 5378 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
5379 | lm2 |= HCI_LM_MASTER; |
5380 | } | |
1da177e4 | 5381 | } |
23691d75 | 5382 | read_unlock(&chan_list_lock); |
1da177e4 LT |
5383 | |
5384 | return exact ? lm1 : lm2; | |
5385 | } | |
5386 | ||
686ebf28 | 5387 | int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 5388 | { |
0139418c MH |
5389 | struct l2cap_conn *conn; |
5390 | ||
1da177e4 LT |
5391 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
5392 | ||
1da177e4 | 5393 | if (!status) { |
1da177e4 LT |
5394 | conn = l2cap_conn_add(hcon, status); |
5395 | if (conn) | |
5396 | l2cap_conn_ready(conn); | |
0139418c | 5397 | } else |
e175072f | 5398 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 LT |
5399 | |
5400 | return 0; | |
5401 | } | |
5402 | ||
686ebf28 | 5403 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
5404 | { |
5405 | struct l2cap_conn *conn = hcon->l2cap_data; | |
5406 | ||
5407 | BT_DBG("hcon %p", hcon); | |
5408 | ||
686ebf28 | 5409 | if (!conn) |
9f5a0d7b | 5410 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
5411 | return conn->disc_reason; |
5412 | } | |
5413 | ||
686ebf28 | 5414 | int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
5415 | { |
5416 | BT_DBG("hcon %p reason %d", hcon, reason); | |
5417 | ||
e175072f | 5418 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
5419 | return 0; |
5420 | } | |
5421 | ||
4343478f | 5422 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 5423 | { |
715ec005 | 5424 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
5425 | return; |
5426 | ||
f62e4323 | 5427 | if (encrypt == 0x00) { |
4343478f | 5428 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 5429 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 5430 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 5431 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 5432 | } else { |
4343478f | 5433 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 5434 | __clear_chan_timer(chan); |
f62e4323 MH |
5435 | } |
5436 | } | |
5437 | ||
686ebf28 | 5438 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 5439 | { |
0139418c | 5440 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 5441 | struct l2cap_chan *chan; |
1da177e4 | 5442 | |
0139418c | 5443 | if (!conn) |
1da177e4 | 5444 | return 0; |
0139418c | 5445 | |
1da177e4 LT |
5446 | BT_DBG("conn %p", conn); |
5447 | ||
160dc6ac | 5448 | if (hcon->type == LE_LINK) { |
35d4adcc HG |
5449 | if (!status && encrypt) |
5450 | smp_distribute_keys(conn, 0); | |
17cd3f37 | 5451 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
5452 | } |
5453 | ||
3df91ea2 | 5454 | mutex_lock(&conn->chan_lock); |
1da177e4 | 5455 | |
3df91ea2 | 5456 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 5457 | l2cap_chan_lock(chan); |
1da177e4 | 5458 | |
f1cb9af5 VCG |
5459 | BT_DBG("chan->scid %d", chan->scid); |
5460 | ||
5461 | if (chan->scid == L2CAP_CID_LE_DATA) { | |
5462 | if (!status && encrypt) { | |
5463 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 5464 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
5465 | } |
5466 | ||
6be36555 | 5467 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
5468 | continue; |
5469 | } | |
5470 | ||
c1360a1c | 5471 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6be36555 | 5472 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
5473 | continue; |
5474 | } | |
5475 | ||
89bc500e GP |
5476 | if (!status && (chan->state == BT_CONNECTED || |
5477 | chan->state == BT_CONFIG)) { | |
a7d7723a GP |
5478 | struct sock *sk = chan->sk; |
5479 | ||
c5daa683 | 5480 | clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); |
a7d7723a GP |
5481 | sk->sk_state_change(sk); |
5482 | ||
4343478f | 5483 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 5484 | l2cap_chan_unlock(chan); |
9719f8af MH |
5485 | continue; |
5486 | } | |
5487 | ||
89bc500e | 5488 | if (chan->state == BT_CONNECT) { |
b1235d79 | 5489 | if (!status) { |
9b27f350 | 5490 | l2cap_send_conn_req(chan); |
b1235d79 | 5491 | } else { |
ba13ccd9 | 5492 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 5493 | } |
89bc500e | 5494 | } else if (chan->state == BT_CONNECT2) { |
6be36555 | 5495 | struct sock *sk = chan->sk; |
b1235d79 | 5496 | struct l2cap_conn_rsp rsp; |
df3c3931 | 5497 | __u16 res, stat; |
1da177e4 | 5498 | |
6be36555 AE |
5499 | lock_sock(sk); |
5500 | ||
b1235d79 | 5501 | if (!status) { |
c5daa683 GP |
5502 | if (test_bit(BT_SK_DEFER_SETUP, |
5503 | &bt_sk(sk)->flags)) { | |
df3c3931 JH |
5504 | struct sock *parent = bt_sk(sk)->parent; |
5505 | res = L2CAP_CR_PEND; | |
5506 | stat = L2CAP_CS_AUTHOR_PEND; | |
05e9a2f6 IK |
5507 | if (parent) |
5508 | parent->sk_data_ready(parent, 0); | |
df3c3931 | 5509 | } else { |
0e587be7 | 5510 | __l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
5511 | res = L2CAP_CR_SUCCESS; |
5512 | stat = L2CAP_CS_NO_INFO; | |
5513 | } | |
b1235d79 | 5514 | } else { |
0e587be7 | 5515 | __l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 5516 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
5517 | res = L2CAP_CR_SEC_BLOCK; |
5518 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
5519 | } |
5520 | ||
6be36555 AE |
5521 | release_sock(sk); |
5522 | ||
fe4128e0 GP |
5523 | rsp.scid = cpu_to_le16(chan->dcid); |
5524 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
5525 | rsp.result = cpu_to_le16(res); |
5526 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e GP |
5527 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
5528 | sizeof(rsp), &rsp); | |
b1235d79 | 5529 | } |
1da177e4 | 5530 | |
6be36555 | 5531 | l2cap_chan_unlock(chan); |
1da177e4 LT |
5532 | } |
5533 | ||
3df91ea2 | 5534 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 5535 | |
1da177e4 LT |
5536 | return 0; |
5537 | } | |
5538 | ||
686ebf28 | 5539 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
5540 | { |
5541 | struct l2cap_conn *conn = hcon->l2cap_data; | |
5542 | ||
5a08ecce AE |
5543 | if (!conn) |
5544 | conn = l2cap_conn_add(hcon, 0); | |
5545 | ||
5546 | if (!conn) | |
1da177e4 LT |
5547 | goto drop; |
5548 | ||
5549 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
5550 | ||
e702112f | 5551 | if (!(flags & ACL_CONT)) { |
1da177e4 LT |
5552 | struct l2cap_hdr *hdr; |
5553 | int len; | |
5554 | ||
5555 | if (conn->rx_len) { | |
5556 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
5557 | kfree_skb(conn->rx_skb); | |
5558 | conn->rx_skb = NULL; | |
5559 | conn->rx_len = 0; | |
5560 | l2cap_conn_unreliable(conn, ECOMM); | |
5561 | } | |
5562 | ||
aae7fe22 AE |
5563 | /* Start fragment always begin with Basic L2CAP header */ |
5564 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
5565 | BT_ERR("Frame is too short (len %d)", skb->len); |
5566 | l2cap_conn_unreliable(conn, ECOMM); | |
5567 | goto drop; | |
5568 | } | |
5569 | ||
5570 | hdr = (struct l2cap_hdr *) skb->data; | |
5571 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
5572 | ||
5573 | if (len == skb->len) { | |
5574 | /* Complete frame received */ | |
5575 | l2cap_recv_frame(conn, skb); | |
5576 | return 0; | |
5577 | } | |
5578 | ||
5579 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
5580 | ||
5581 | if (skb->len > len) { | |
5582 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
5583 | skb->len, len); | |
5584 | l2cap_conn_unreliable(conn, ECOMM); | |
5585 | goto drop; | |
5586 | } | |
5587 | ||
5588 | /* Allocate skb for the complete frame (with header) */ | |
af05b30b GP |
5589 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
5590 | if (!conn->rx_skb) | |
1da177e4 LT |
5591 | goto drop; |
5592 | ||
d626f62b | 5593 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 5594 | skb->len); |
1da177e4 LT |
5595 | conn->rx_len = len - skb->len; |
5596 | } else { | |
5597 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
5598 | ||
5599 | if (!conn->rx_len) { | |
5600 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
5601 | l2cap_conn_unreliable(conn, ECOMM); | |
5602 | goto drop; | |
5603 | } | |
5604 | ||
5605 | if (skb->len > conn->rx_len) { | |
5606 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
5607 | skb->len, conn->rx_len); | |
5608 | kfree_skb(conn->rx_skb); | |
5609 | conn->rx_skb = NULL; | |
5610 | conn->rx_len = 0; | |
5611 | l2cap_conn_unreliable(conn, ECOMM); | |
5612 | goto drop; | |
5613 | } | |
5614 | ||
d626f62b | 5615 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 5616 | skb->len); |
1da177e4 LT |
5617 | conn->rx_len -= skb->len; |
5618 | ||
5619 | if (!conn->rx_len) { | |
5620 | /* Complete frame received */ | |
5621 | l2cap_recv_frame(conn, conn->rx_skb); | |
5622 | conn->rx_skb = NULL; | |
5623 | } | |
5624 | } | |
5625 | ||
5626 | drop: | |
5627 | kfree_skb(skb); | |
5628 | return 0; | |
5629 | } | |
5630 | ||
aef7d97c | 5631 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 5632 | { |
23691d75 | 5633 | struct l2cap_chan *c; |
1da177e4 | 5634 | |
333055f2 | 5635 | read_lock(&chan_list_lock); |
1da177e4 | 5636 | |
23691d75 GP |
5637 | list_for_each_entry(c, &chan_list, global_l) { |
5638 | struct sock *sk = c->sk; | |
101545f6 | 5639 | |
903d343e | 5640 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
5641 | batostr(&bt_sk(sk)->src), |
5642 | batostr(&bt_sk(sk)->dst), | |
89bc500e | 5643 | c->state, __le16_to_cpu(c->psm), |
23691d75 GP |
5644 | c->scid, c->dcid, c->imtu, c->omtu, |
5645 | c->sec_level, c->mode); | |
61e1b4b7 | 5646 | } |
1da177e4 | 5647 | |
333055f2 | 5648 | read_unlock(&chan_list_lock); |
1da177e4 | 5649 | |
aef7d97c | 5650 | return 0; |
1da177e4 LT |
5651 | } |
5652 | ||
aef7d97c MH |
5653 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
5654 | { | |
5655 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
5656 | } | |
5657 | ||
5658 | static const struct file_operations l2cap_debugfs_fops = { | |
5659 | .open = l2cap_debugfs_open, | |
5660 | .read = seq_read, | |
5661 | .llseek = seq_lseek, | |
5662 | .release = single_release, | |
5663 | }; | |
5664 | ||
5665 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 5666 | |
64274518 | 5667 | int __init l2cap_init(void) |
1da177e4 LT |
5668 | { |
5669 | int err; | |
be9d1227 | 5670 | |
bb58f747 | 5671 | err = l2cap_init_sockets(); |
1da177e4 LT |
5672 | if (err < 0) |
5673 | return err; | |
5674 | ||
aef7d97c MH |
5675 | if (bt_debugfs) { |
5676 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
5677 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
5678 | if (!l2cap_debugfs) | |
5679 | BT_ERR("Failed to create L2CAP debug file"); | |
5680 | } | |
1da177e4 | 5681 | |
1da177e4 | 5682 | return 0; |
1da177e4 LT |
5683 | } |
5684 | ||
64274518 | 5685 | void l2cap_exit(void) |
1da177e4 | 5686 | { |
aef7d97c | 5687 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 5688 | l2cap_cleanup_sockets(); |
1da177e4 LT |
5689 | } |
5690 | ||
d1c4a17d GP |
5691 | module_param(disable_ertm, bool, 0644); |
5692 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |